Butterfree in Polished Crystal

Bug / Psychic — where to catch it, what it learns, and how it differs from the official games.

Compared with the official games

Stats Sp. Atk 90 → 110, Sp. Def 80 → 110, Speed 70 → 80 (total 395 → 455)
Type Bug / Flying → Bug / Psychic
Abilities gains Levitate

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

Other changes in this hack

Learns Gust the moment it evolves
Wild held items: Shed Shell, SilverPowder
Catch rate 45
Base experience 185
EV yield: 2 SAt, 1 SDf
Egg groups: Bug
Growth rate: Medium Fast
Faithful build: base experience 160
Move tutors: Baton Pass, Double-Edge, Dream Eater, Endure, Skill Swap, Sleep Talk, Swagger

In the Faithful version

Everything above is the Polished version. In Faithful, its types are Bug / Flying; abilities are Compound Eyes, Tinted Lens; base stats are 60 / 45 / 50 / 90 / 80 / 70.

Butterfree in other guides

The same Pokémon, as 16 other hacks change it:

Unbound Emerald Rogue Infinite Fusion Radical Red Gaia Blaze Black 2 Redux & Volt White 2 Redux Inclement Emerald Elite Redux Emerald Imperium Emerald Kaizo Blaze Black 2 & Volt White 2 Sacred Gold & Storm Silver Renegade Platinum Rising Ruby & Sinking Sapphire Blaze Black & Volt White Fire Red Omega

Where to find Butterfree

Area	Method	Level
Cerulean Cape	Grass (morning/day)	48-53
Ilex Forest	Headbutt	10	5% rare
Murky Swamp	Headbutt	10	5% rare
National Park	Bug-Catching Contest	7-18	5% rare
Noisy Forest	Grass (morning)	Base−1 to Base+4
Noisy Forest	Grass (morning)	Base−1 to Base+4
Route 2 North	Grass (day)	54-59
Route 2 North	Grass (day)	54-59
Route 2 North	Grass (morning)	54-59
Route 2 North	Grass (morning)	54-59
Route 2 South	Grass (day)	54-59
Route 2 South	Grass (day)	54-59
Route 2 South	Grass (morning)	54-59
Route 2 South	Grass (morning)	54-59
Route 24	Grass (morning/day)	48-53
Route 25	Grass (morning/day)	48-53
Viridian Forest	Grass (day)	55-60
Viridian Forest	Grass (morning)	55-60
Yellow Forest	Headbutt	10	5% rare

Level-up moves

Lv	Move	Type	Cat	Pow	Acc	PP
1	Gust Whips up a strong gust of wind.	Flying	Spec	40	100	35
1	String Shot A move that lowers the foe's Speed.	Bug	Stat	—	95	40
1	Tackle A full-body charge attack.	Normal	Phys	40	100	35
11	Confusion	Psychic	Spec	50	100	25
13	PoisonPowder A move that may poison the foe.	Poison	Stat	—	75	35
15	Stun Spore	Grass	Stat	—	75	30
17	Sleep Powder	Grass	Stat	—	75	15
19	Psybeam	Psychic	Spec	65	100	20
23	Supersonic	Normal	Stat	—	65	20
25	Safeguard Prevents all status problems.	Normal	Stat	—	—	25
29	Hypnosis May cause the foe to fall asleep.	Psychic	Stat	—	60	20
31	Bug Buzz	Bug	Spec	90	100	10
35	Reflect Raises Defense with a barrier.	Psychic	Stat	—	—	20
37	Agility Sharply raises the user's Speed.	Psychic	Stat	—	—	30
41	HealingLight Restores HP based on weather.	Normal	Stat	—	—	5
43	Air Slash	Flying	Spec	75	95	15
47	Psychic	Psychic	Spec	90	100	10

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

TMs & HMs (28)

#	Move · where to get it	Type	Pow
TM03	Curse Celadon Mansion	Ghost	—
TM06	Toxic Celadon Game Corner	Poison	—
TM09	Venoshock Route 11	Poison	65
TM10	Hidden Power Lake of Rage	Unknown	70
TM11	Sunny Day Celadon Dept. Store	Fire	—
TM15	Hyper Beam Goldenrod Dept. Store	Normal	150
TM17	Protect Goldenrod Dept. Store	Normal	—
TM18	Rain Dance Celadon Dept. Store	Water	—
TM19	Giga Drain Erika	Grass	75
TM20	Safeguard Celadon Dept. Store	Normal	—
TM22	Solar Beam Goldenrod Dept. Store	Grass	120
TM27	Return Goldenrod Dept. Store	Normal	1
TM30	Shadow Ball Morty	Ghost	80
TM32	Double Team Celadon Game Corner	Normal	—
TM33	Reflect Goldenrod Dept. Store	Psychic	—
TM39	Swift Union Cave	Normal	60
TM40	Aerial Ace Mount Mortar	Flying	60
TM41	Substitute Lake of Rage	Normal	—
TM42	Facade Dim Cave	Normal	70
TM44	Rest Dim Cave	Psychic	—
TM45	Attract Whitney	Normal	—
TM46	Thief Team Rocket Base	Dark	60
TM51	Roost Falkner	Flying	—
TM53	Energy Ball Olivine Lighthouse	Grass	90
TM62	Acrobatics Route 39 Farmhouse	Flying	55
TM68	Giga Impact Celadon Game Corner	Normal	150
TM69	U-turn Bugsy	Bug	70
TM70	Flash Sprout Tower	Normal	—