Which Pokemon is synonym of nostalgia to you?

I expect a lot of you to reply with starters or Kanto Pokémon. However I'm still curious to know which Mon can bring you back to simpler times.

For me, it's Hoothoot. Just seeing this round little guy brings me back to the early game of HG (My first game was Sapphire so it's not only related to one's first game).

So yeah, I really like Hoothoot. What's yours?