Eterna Forest: 27 species in 2 games

27 species, 3 versions

Diamond and PearlPlatinum

Diamond and Pearl: 18 species
Species	Method	Levels	Chance	Game page
Metapod	Walking in tall grass or a cave	12	8%	All places
Kakuna	Walking in tall grass or a cave	12	8%	All places
Aipom	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	up to 10%	All places
Murkrow	Walking in tall grass or a cave	10 to 11	20%	All places
Pineco	Walking in tall grass or a cave	12	8%	All places
Heracross	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	5%	All places
Wurmple	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	up to 40%	All places
Wurmple	Walking in tall grass or a cave	10 to 11	up to 20%	All places
Silcoon	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	20%	All places
Silcoon	Walking in tall grass or a cave	10	20%	All places
Beautifly	Walking in tall grass or a cave	12	2%	All places
Seedot	Walking in tall grass or a cave	12	8%	All places
Slakoth	Walking in tall grass or a cave	10	40%	All places
Nincada	Walking in tall grass or a cave	10 to 12	22%	All places
Budew	Walking in tall grass or a cave	10 to 12	up to 10%	All places
Burmy	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	up to 20%	All places
Combee	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	up to 40%	All places
Cherubi	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	up to 20%	All places
Buneary	Walking in tall grass or a cave	10 to 12	up to 10%	All places
Munchlax	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	100%	All places

Platinum: 25 species
Species	Method	Levels	Chance	Game page
Caterpie	Walking in tall grass or a cave	13	4%	All places
Metapod	Walking in tall grass or a cave	13	4%	All places
Weedle	Walking in tall grass or a cave	13	4%	All places
Kakuna	Walking in tall grass or a cave	13	4%	All places
Gastly	Walking in tall grass or a cave	13	up to 4%	All places
Hoothoot	Walking in tall grass or a cave	12	10%	All places
Aipom	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	up to 15%	All places
Pineco	Walking in tall grass or a cave	13	8%	All places
Heracross	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	5%	All places
Wurmple	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	20%	All places
Wurmple	Walking in tall grass or a cave	10	up to 10%	All places
Silcoon	Walking in tall grass or a cave	12	5%	All places
Beautifly	Walking in tall grass or a cave	14	1%	All places
Cascoon	Walking in tall grass or a cave	12	5%	All places
Dustox	Walking in tall grass or a cave	14	1%	All places
Seedot	Walking in tall grass or a cave	13	8%	All places
Slakoth	Walking in tall grass or a cave	10 to 11	40%	All places
Nincada	Walking in tall grass or a cave	11 to 14	22%	All places
Bidoof	Walking in tall grass or a cave	12	10%	All places
Kricketot	Walking in tall grass or a cave	10 to 12	up to 10%	All places
Budew	Walking in tall grass or a cave	10 to 12	up to 20%	All places
Burmy	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	up to 40%	All places
Combee	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	up to 40%	All places
Cherubi	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	up to 20%	All places
Buneary	Walking in tall grass or a cave	11 to 13	up to 20%	All places
Munchlax	Slathering a honey tree with honey and waiting for a pokémon to appear	5 to 15	100%	All places