True fact: lack of minigames is the reason I don't own any of the Pokémon console "battling" games.
The minigames were the best part of Stadium 1 & 2! I loved them so much and I still boot up my N64 to play them with my brother sometimes. D: In the first game, I loved the Metapod, Clefairy, and Rattata ones. (And I guess the Drowzee one because I was the only one of my friends who understood how to play it and thus was any good at it for years. xD)
In the second Stadium, I like the Chansey and Scyther ones... but top favourite has to be the counting game with Cleffa/Igglybuff. XD That one is so much fun simply because I like the premise, but the CPUs are SO STUPID. Sooo many times they'd keep counting when everything had gone by and be like 5 ahead of everyone else. And in the Chansey one, my brother and I played last week and on the easiest level, if we just set our controllers down, we can sometimes win the game just by getting everything that comes down the middle because the CPUs are so bad at it.
:') Oh man nostalgia rush. This is why they need to put minigames back in!