I’m a bit late, so I’ll answer the former questions as well.
1) Favorite Alolan Pokémon: Alolan Sandslash. Sandslash, alongside Wartortle, has always stuck-out to me as one of the more nostalgic Pokémon of the franchise, having seen a sticker of one in my early days of the fandom. I was so excited to see it get a new form with my favorite Type (Ice)! I’m not a huge fan of its stock Sugimori art, but I love it in the games. It (as a Sandshrew) was also my first full-odds Shiny in Sun & Moon.
2) Favorite Baby Pokémon: I usually answer this question with Tyrogue. It looks quite cool (even more-so Shiny) and the fact that it was sort of a hidden Pokémon in Gen. II made it even more appealing. However, from a nostalgic point of view, Magby is my favorite (especially its Neo Genesis card).
3) Favorite Resurrected Pokémon: Omanyte! I remember trading a snack for a Japanese Omanyte card in elementary school and making the connection between it and ammonites I saw in a library book. The card had a black speck on it, so I thought for a long time that Omanyte had a cute little mouth below its eyes before I finally scratched it off.
I discovered in recent years that there were fossils around my house, so that made me want to find an ammonite fossil. Further research showed that finding any kind of ammonoid here was unlikely since plant fossils were abundant, but I did eventually find a small water-worn ammonoid (a Goniatite) in the creek one day. It isn’t much to look at, but it’s my little Helix Fossil. <3
4) Favorite Poison Pokémon: Nidoran (Male). Mainly because I found a Shiny one in FireRed’s Safari Zone (and luckily caught it), but it’s also adorable. If the cartridge hadn’t been lost, it would’ve been my first Shiny that could’ve been transferred to the modern games and would probably be on my main team today.
5) Favorite Fairy Pokémon: Togetic. There may be a few that I prefer more design-wise, but my first Pokémon game was Silver Version, making Togetic quite nostalgic.