Decidueye (Hisui)

GrassFightingOvergrow, Ripen, Scrappy (hidden)

In Parallel Emerald: It is not in any of this guide's encounter tables. Grass / Fighting type, base stats total 530.

Level-up moves 24

Lv	Move	Type	Cat	Pow	Acc	PP
1	Growl Lowers the target’s Attack by one stage.	Normal	Stat	—	100	40
1	Phantom Force User vanishes, dodging all attacks, and hits next turn. Hits through Protect and Detect.	Ghost	Phys	90	100	10
1	Tackle Inflicts regular damage with no additional effect.	Normal	Phys	40	100	35
1	Triple Arrows	Fighting	Phys	90	100	10
5	Leafage Inflicts regular damage with no additional effect.	Grass	Phys	40	100	40
7	Astonish Has a chance to make the target flinch.	Ghost	Phys	30	100	15
9	Confide Lowers the target’s Special Attack by one stage.	Normal	Stat	—	—	20
12	Gust Inflicts regular damage and can hit Pokémon in the air.	Flying	Spec	40	100	35
14	Razor Leaf Has an increased chance for a critical hit.	Grass	Phys	55	100	25
17	Aerial Ace Never misses.	Flying	Phys	60	—	20
18	Shadow Sneak Inflicts regular damage with no additional effect.	Ghost	Phys	40	100	30
20	Synthesis Heals the user by half its max HP. Affected by weather.	Grass	Stat	—	—	5
23	Feather Dance Lowers the target’s Attack by two stages.	Flying	Stat	—	100	15
25	Hex Has double power if the target has a major status ailment.	Ghost	Spec	65	100	10
27	Haze Resets all Pokémon’s stats, accuracy, and evasion.	Ice	Stat	—	—	30
30	Dual Wingbeat Hits twice in one turn.	Flying	Phys	40	100	10
34	Defog Lowers the target’s evasion by one stage. Removes field effects from the enemy field.	Flying	Stat	—	—	15
38	Leaf Blade Has an increased chance for a critical hit.	Grass	Phys	90	100	15
41	U-turn User must switch out after attacking.	Bug	Phys	70	100	20
45	Sucker Punch Only works if the target is about to use a damaging move.	Dark	Phys	70	100	5
49	Bulk Up Raises the user’s Attack and Defense by one stage.	Fighting	Stat	—	—	20
53	Brave Bird User receives 1/3 the damage inflicted in recoil.	Flying	Phys	120	100	15
56	Close Combat Lowers the user’s Defense and Special Defense by one stage after inflicting damage.	Fighting	Phys	120	100	5
60	Poltergeist Fails if the target has no held item.	Ghost	Phys	110	90	5

* a legal move, just moved to level-up · ** new to this game

TMs & HMs 40

#	Move · where to get it	Type	Pow
TM01	Close Combat Victory Road	Fighting	120
TM06	Toxic Route 127	Poison	—
TM08	Bulk Up Sootopolis City	Fighting	—
TM09	Bullet Seed Route 104	Grass	25
TM10	Hidden Power Slateport City	Normal	60
TM11	Sunny Day Lilycove City	Fire	—
TM12	Taunt Sootopolis City Gym	Dark	—
TM15	Hyper Beam Victory Road	Normal	150
TM17	Protect Petalburg City Gym	Normal	—
TM18	Rain Dance Lilycove City	Water	—
TM19	Giga Drain Meteor Falls	Grass	80
TM21	Frustration Slateport City	Normal	—
TM22	Solar Beam Route 119	Grass	120
TM27	Return Slateport City	Normal	—
TM31	Brick Break Jagged Pass	Fighting	75
TM32	Double Team Froster Cave	Normal	—
TM34	Leaf Blade Route 123	Grass	90
TM39	Rock Tomb Slateport City	Rock	60
TM40	Aerial Ace Slateport City	Flying	60
TM42	Facade Route 115	Normal	70
TM44	Rest Rustboro City	Psychic	—
TM46	Thief Rustboro City Gym	Dark	60
TM49	Dual Wingbeat Froster Cave B3F	Flying	40
TM51	Roost Fortree City	Flying	—
TM52	Focus Blast Abandoned Ship	Fighting	120
TM53	Energy Ball Route 118	Grass	90
TM60	Drain Punch Mossdeep City	Fighting	75
TM63	Rock Slide Fallarbor Town	Rock	75
TM65	Shadow Claw Fallarbor Town	Ghost	70
TM68	Giga Impact Victory Road	Normal	150
TM71	Stone Edge Shoal Cave	Rock	100
TM75	Swords Dance Route 114	Normal	—
TM86	Grass Knot Dewford Town Gym	Grass	—
TM88	Low Sweep Slateport City	Fighting	65
TM90	Substitute Pacifidlog Town	Normal	—
TM94	Sucker Punch Mossdeep City	Dark	70
TM98	False Swipe Route 116	Normal	60
TM100	Curse Mossdeep City	Ghost	—
HM04	Strength Dewford Town	Normal	80
HM06	Rock Smash Mauville City	Fighting	40

Where to find Decidueye (Hisui)

Not found in the wild — evolve or trade for it.

Other changes in this game

How to get it: Buy at Mauville Game Corner, Safari Zone.

Base stats

HP88

Attack112

Defense80

Sp. Attack95

Sp. Defense95

Speed60

Total530

Compared with the official games

Against the base species it is built from:

Stats HP 78 → 88, Attack 107 → 112, Defense 75 → 80, Sp. Atk 100 → 95, Sp. Def 100 → 95, Speed 70 → 60
Type Grass / Ghost → Grass / Fighting
Abilities gains Ripen, Scrappy and loses Long Reach

Compared against present-day official data. The Fairy type and hidden abilities arrived after Pokémon Emerald, so a difference here can belong to the series rather than to this game.

Decidueye (Hisui) in other guides

The same Pokémon, as 15 other hacks change it:

Emerald Rogue Pokémon Soulgold Pokémon Heart & Soul Radical Red Pokémon Crystal Inheritance Pokémon Crippling Medical Debt Edition Pokémon Emerald Imperium Pokémon: Wishes of Tomorrow Pokémon Exceeded Pokémon Emerald Squared Poke47 HeartGold Generations Pokémon Emerald Blitz Pokémon CC: Operation Masquerade Pokémon Black Pearl Emerald