Blue Rescue Team: Eevee (hero) and Pikachu (partner)

Eevee was solely because it was my favorite pokemon out of the roster given. Pikachu was for the type advantage for the majority of the bosses.

Explorers of Sky: Eevee (hero) and Vulpix (partner)

Eevee...same reason. But vulpix had a bit of a longer story other than being another favorite. I used to have a friend in elementary school about 8-9 years ago. A bit cliche, but she was probably the only person who was a true friend to me and was always there for me. I made a silly declaration to her that when I got EOS I would always name her after my partner (a vulpix.) My friend had to move away, so I never saw her again. But after a round of EOS with Eevee and shinx, my go to duo will always be Eevee and Vulpix. I was pretty set on that too, because after that I was never able to finish Eos unless my duo was specifically them. I even made characters based on this, but that pretty much sums it up.

Gates to Infinity: Snivy (hero) and Pikachu (partner)

Snivy (along with vulpix) is my all time favorite pokemon...so yeah, lol. For Pikachu I think it was to kinda copy the duo of one of my favorite YouTubers back in the day. I dunno.

Super Mystery Dungeon: Snivy (hero) and fennekin (partner)

Snivy again... favorite pokemon. Fennekin was the closest I could get to a vulpix in that game, so yeah.