Pocket Monsters RPG" was an unreleased Pokémon N64 game. It was planned for the Nintendo 64DD, but was canceled during development. Here is what it could have been (fan made screenshots) :
Nintendo 64 Longplay [057] Pokemon Stadium - YouTube
Pokémon Stadium | Video Games & Apps
Nintendo N64 5 Set of Pokemon Games Retro Game From Japan for Nintendo 64 | eBay
Pokemon N64 Game cartridge for Nintendo 64 Video Games MARIO PARTY 2 ZELDA OCANIEN OF TIME Console US Version English NTSC _ - AliExpress Mobile
Ranking all 21 'Pokémon Stadium' minigames, from “Snore War” to “Sushi-Go-Round”
Pokémon Stadium - Bulbapedia, the community-driven Pokémon encyclopedia
N64 Authentic Pokemon Stadium 2 Pokemon Puzzle League Paper - Etsy