2 of 2 for Pokémon Day 2025 and sequel to this-
https://www.furaffinity.net/view/44385543/

Three years ago, Mike found fire stone and his brother Mark turned into Arcanine. Three years later, Mike finds a strange looking Pokeball and shows it to his brother Mark. Mark ask is it a pokeball. Mike answers he doesn't know as Mark starts to transform with his chest gaining fur, his head while Mike telling him he is transforming. Mike tells Mark that strange pokeball might not be normal. Mark's eyes pop out surprised toon like as he is fully transformed into am Arcanine which Mike tells he is. Mark does a wildtake while looking at his paws and yells out his Mike transformed him into Arcanine again. Mike points out he liked it the first time. Mark says he does like it but was surprised it happened again.

Arcanine- Pokemon Company
Mark and Mike-  Hybrid-Tigerwolf