Crests

Crests are held items unique to Pokémon Rejuvenation. Similarly to canonical held items like Light Ball or Thick Club, they are specific to one species of Pokémon and confer strong boosts to the Pokémon holding its corresponding Crest.

Mechanics

Battle UI with an Active Crest (bottom) vs no Crest (top)

Crest have a wide variety of effects, ranging from simple stat boosts, over granting additional abilities, up to having completely custom effects.

An active Crest (a Crest held by a Pokémon that it is meant for) can't be removed from their owner during battle. Trick and similar moves will fail, Knock Off will still do damage but won't remove the Crest.

A Pokémon holding their corresponding Crest will have an UI icon during battle alerting the player to the Crest's presence.

Crests that swap the stats of the user (for example the Magcargo Crest) swap the fully calculated stat after application of IVs, EVs and Nature, as an example, in the case of Magcargo the Defense and Speed stats are swapped, this results in EVs invested in Defense being effectively Speed EVs, and the other way around. In battle stat boosts will not be swapped accordingly, so to continue the example, a crested Magcargo using Harden will still boost it's defense.

Background

Most Crests were created long ago using ancient Garufan magic. These rituals usually required Pokémon or human sacrifices. These two facts go a long way to explain the rarity of Crests, although it should be noted that Crests for more modern Pokémon (e.g. Castform) seemingly don't require these rituals: for example, the Castform Crest is created by a Ranger in Terajuma Jungle simply by giving him the TMs for Hail, Sunny Day and Rain Dance.

List of Crests

Quoted effect text is the in game description, for elaboration see the Crest's respective page.

Crest	Effect	Location
Aevian Ampharos	The move in the first move slot is boosted by 50% if it is not Electric- or Ice-type, 20% otherwise. Damage from super effective attacks is reduced by 30%.	District of Hope graveyard, from Zumi after finishing the "Pictozumi" quest and the movie quest in PokeStar studios
Ariados	Ariados's speed is increase by 50%. Deals critical hits against slowed or poisoned targets.	Route 6 - Underwater Archive
Bastiodon	Attackers take 50% of the damage they deal as recoil, and the wearer is healed the same amount.	Kingdom of Goomidra - Shop
Beheeyem	May disable opponent's move and faster opponents do reduced damage.	N/A
Boltund	Gain a 1.5x boost to biting moves if Boltund moves before target.	Route 4 - Cairo's Red Essence Shop (13 Badges)
Castform	Castform uses the first weather move it knows. Its Forecast forms also become empowered.	Weather Institute - Received from a Ranger
Cherrim	It forces Cherrim into Sunshine Form and activates Flower Gift regardless of weather.	Nastasia's Airship - Gift from Aelita
Cinccino	All moves turn into multi-hit moves (2-5 hits at 30% the BP).	Route 4 - Cairo's Red Essence Shop (13 Badges)
Claydol	Claydol's Special attacks use its Defense stat. The power of beam moves is increased by 50%.	Castle Zygara
Cofagrigus	It increases Cofagrigus's Sp. Def and Sp. Atk by 25%.	Zorrialyn Labyrinth - Crypt
Crabominable	Powers up moves by 50% if holder takes damage before using them. Defenses raised by 20%	Evergreen Island - Reward for showing The Emperor to Nana.
Cryogonal	Increases Cryogonal's Sp.Def by 20%, then increases its other stats by 10% of its Sp.Def.	Gearen Lab - From Alex in the Development Room
Darmanitan	Darmanitan is forced into Zen Mode while holding this crest.	Castle Zygara
Dedenne	Dedenne's Physical attacks use its Speed stat rather than its Attack stat.	Kingdom of Goomidra - Shop
Delcatty	The power of its non-KO'd friends increases Delcatty's stats by 10% each.	Route 4 - Cairo's Red Essence Shop (15 Badges)
Druddigon	Heals in the sun and from Fire moves. Fire and Dragon moves get boosted by 30%.	Route 4 - Cairo's Red Essence Shop (8 Badges)
Dusknoir	It increases Dusknoir's Attack by 20% and boosts weaker moves.	Sashila Village - Reward from the Archaeologist
Electrode	The targets Defense stat is halved when Electrode is attacking.	Route 6 - Center chest of the Xen Battleship closest to Valor Mountain
Empoleon	Empoleon's Ice-type moves are boosted by 50%, and Speed is doubled in Hail and on Ice Fields.	Route 11 - Spring Maintenance, reward from Jolene
Fearow	Increases the power of stabbing moves by 50%. Increase critical hit ratio by 1.	Zorrialyn Labyrinth - 2nd Floor
Furret	Upon switching in, Furret loses 25% of its Max Hp to create a substitute.	Telia Resort - Tesla's villa, in your room.
Feraligatr	First move has higher priority if it's damaging. Biting moves deal 50% more damage.	West Gearen City - Reward from Barbara OR Route 2 - Kecleon's Shop
Glaceon	It takes resisted damage from Rock and Fighting attacks.	Zorrialyn Labyrinth - 3rd Floor
Gothitelle	Using Dark and Psychic type moves swaps between respective types. Recovers HP.	Fort Rystrine - Inside the lowest building, on the left hand side.
Hypno	It increases Hypno's Special Attack and Accuracy by 50%.	Zorrialyn Labyrinth - 2nd Floor
Infernape	Infernape's Attacking and Defensive stats are swapped. 1/16th Max Hp is restored every turn.	Goomidra Castle - Reward from King Goodroh
Leafeon	It takes resisted damage from Fire and Flying attacks.	Zorrialyn Labyrinth - 3rd Floor
Ledian	Ledian punches four times at once. Secondary effects only occur on the first two hits.	Zone Zero - Reward from Challenger Venus
Luvdisc	The Base Power of all damaging moves matches Luvdisc's happiness, capping at a Base Power of 250.	Zorrialyn Labyrinth - 4th floor, held by a Luvdisc in the south-west room
Luxray	STAB on Dark moves and gains Dark-type resistances. Normal type moves are Galvanized.	Route 4 - Cairo's Red Essence Shop (8 Badges)
Magcargo	It swaps Magcargo's Defense and Speed and increases Sp. Atk by 10%.	Zorrialyn Labyrinth - 1st Floor
Meganium	Meganium and allies take reduced damage and recover every turn.	West Gearen City - reward from Barbara OR Route 2 - Kecleon's Shop
Noctowl	Increases Special Defense upon being hit. Increases Defense by 20%.	Route 4 - Cairo's Red Essence Shop
Oricorio	It increases Oricorio's Speed and Sp. Atk stat by 25%.	Zorrialyn Labyrinth - 1st Floor
Phione	Phione is granted a 50% increase in defenses and Aqua Ring.	Kristiline Town - Reward from Aquis after Tale of Two Hearts is completed
Probopass	Levitates. Mini-noses do 3-hit 20BP type-based damage after a damaging move.	Route 4 - Cairo's Red Essence Shop (13 Badges)
Rampardos	Rampardos will always hang on with 1 HP regardless of HP once per battle and does not take recoil.	Kingdom of Goomidra - Shop
Relicanth	It increases Relicanth's Attack by 20% and Sp. Def by 30%.	Zorrialyn Labyrinth - 4th Floor
Reuniclus	Move category changes user to a Physical Fighting or Special Psychic type. First move determines initial form.	Fort Rystrine - Inside the lowest building, on the left hand side.
Samurott	Gains Fighting-type STAB and resistances. Slicing moves always result in critical hit.	Route 4 - Cairo's Red Essence Shop (8 Badges)
Sawsbuck	Replace's Normal-Type with seasonal type. Normal-type moves become seasonal type and are boosted by 20%.	Rose Theater - After completing the Kimono girls sidequest, talk to the Kimono girl in the crowd.
Seviper	It causes Seviper to hit harder against healthier foes. Speed increased by 50%.	Zorrialyn Labyrinth - 1st Floor
Shiinotic	Drains 1/16th hp from statused pokemon at the end of the turn. Draining effect recovery is boosted by 30%	Darchlight Manor - In the safe
Simipour	Gains Grass type STAB and resistances. Normal type moves become Grass type. Offenses boosted by 20%.	Route 4 - Cairo's Red Essence Shop
Simisage	Gains Fire type STAB and resistances. Normal type moves become Fire type. Offenses boosted by 20%.	Route 4 - Cairo's Red Essence Shop
Simisear	Gains Water type STAB and resistances. Normal type moves become Water type. Offenses boosted by 20%.	Route 4 - Cairo's Red Essence Shop
Silvally	Has a special effect for each held Memory and boosts that type's attacks.	N/A
Skuntank	Nullifies damage and boosts Attack when hit by a Ground-type move. Increases Attack and Sp.Atk by 20%.	Zorrialyn Labyrinth - 4th Floor
Spiritomb	Spiritomb becomes stronger for each defeated ally. Recovers health based on KO'd enemies.	Castle Zygara
Stantler	Increases Stantler's and Wyrdeer's Attack and Accuracy by 50%.	Zorrialyn Labyrinth - 2nd Floor
Swalot	Stockpiles gained after an attack. Belch always usable and followed by Spit Up.	Route 4 - Cairo's Red Essence Shop (13 Badges)
Thievul	Decreases opponent's Sp.Atk by one stage, increasing Thievul's by one stage on switch.	Route 4 - Cairo's Red Essence Shop (8 Badges)
Torterra	Torterra's resistances and weaknesses are swapped, retaining immunities. Attacks restore HP.	Castle Zygara
Typhlosion	Typhlosion's Attack is equivalent with Sp.Atk, and contact moves do an additional hit of damage.	West Gearen City - reward from Barbara OR Route 2 - Kecleon's Shop
Vespiquen	Attack Order and Defense Order grant a 50% boost to Offenses or Defenses, that switch around when the other is used.	Lost Castle - After interacting with the 9 badge doors
Whiscash	Nullifies damage and boosts Attack when hit by a Grass-type move. Increase Atk and Sp.Atk by 20%	Kingdom of Goomidra - Shop
Zangoose	Zangoose becomes poisoned upon switching in, and restores HP while poisoned.	Route 6 - Underwater Archive
Zoroark	Grants the ability and STAB of the copied Pokémon to Unovan Zoroark.	Garufa Sanctuary - Behind the Hisuan Zorua

Trivia

• Crests usually are given to weaker Pokémon, so that they may be viable even in the late game.
• If one Pokémon of a distinct group (starter trios, version counterparts etc.) receives a crest, the other Pokémon of that group generally also receive one, resulting in some already "strong" Pokémon receiving crests, such as Empoleon and Infernape. However, as of the current version of the game, the only exception is Samurott, which received a Crest while Serperior and Emboar still currently lack one.
• Silvally's Crest is the only Crest that works without being held, granting its effects as long as it is present in the bag. It is the only one that has different effects depending on which Memory (if any) Silvally is currently holding.
• As of v13.5, the Silvally and Beheeyem crests are the only crests that are implemented but not available to the player, though Beheeyem's crest was available in the Zorrialyn labyrinth in earlier versions.
• Crests check for the current species of the holder, as such a Transform User holding a Crest, will receive the Crest's effects if it transforms into the Pokémon whose crest it is holding (e.g. if a Ditto with the Typhlosion Crest transforms into Typhlosion, it will reap the effects of the Crest). The reverse also happens: a Pokémon holding its appropriate Crest will lose the Crest effect if it transforms into a different Pokemon (e.g. Transform Leafeon holding the Leafeon Crest will lose the Leafeon Crest's effects if it transforms into a different Pokémon).