>>35644347 Gen 2 is pretty fucking comfy, a very fun experience, just don't expect any sort of challenge after the 4th gym 'cause enemies aren't getting much stronger then that.
I always found Gen 4 game speed too slow to be enjoyable (yes, even Platinum and HGSS), but clearly I'm in the minority, most peolpe would tell you Platinum is in the top 3 Pokémon games, so check that out too.