Okay, I really enjoy this game, but it DOES require a little bit of research, admittedly. So bear with me here.
The rules are as follows: Someone lists a Pokémon, and then you respond with a Pokémon that may be found a place that Pokémon may be found in (across any game) and list the location. I'll lead off with an example at the end here. Also, don't use Legendaries, since some of them can only be found in one place.
Here's a link to Bulbapedia, which is what I use to find Pokémon locations.
So with that all said... let's open with a classic, Pikachu.
And end with something a little less classic: Marill, which can be caught in the Trophy Garden in Platinum.
The rules are as follows: Someone lists a Pokémon, and then you respond with a Pokémon that may be found a place that Pokémon may be found in (across any game) and list the location. I'll lead off with an example at the end here. Also, don't use Legendaries, since some of them can only be found in one place.
Here's a link to Bulbapedia, which is what I use to find Pokémon locations.
So with that all said... let's open with a classic, Pikachu.
And end with something a little less classic: Marill, which can be caught in the Trophy Garden in Platinum.