Springtime Bonnie in 'FNAF AR' is one of those seasonal skins that pops up around Easter, and tracking him down can be a mix of luck and strategy. From what I've seen, he usually appears in the wild during limited-time events, so keeping an eye on official announcements is key. I missed him the first year because I wasn't paying attention to the event dates—big regret!
Some players swear by using lures with Bonnie as the base character, though I haven't had consistent success with that. The drop rates for event skins can be brutal, so I ended up grinding encounters and trading with friends. If you've got extra Faz-Coins, saving them for event lures might help, but honestly, patience and persistence seem to be the real MVPs here.