How insane would the original Legend of Zelda be if there was 151 different kinds of creatures to battle? Someone needs to make that game.
A game where you fight 151 pokemon is any of the mystery dungeon series
Pokemon are technically in Hyrule when you play as a Pokemon character in any one of the LOZ-inspired stages from the Super Smash Bros. series.
Not according to SSB canon. None of the stages or characters are from their respective series, they are playsets and models from a toy box.