Boars are mostly the first game. There is boar scene early on in GT in Haven, but it requires a few different steps to unlock:
1. Transferring the datacrystal.js file from the first game AFTER YOU'VE COMPLETED A GAME where you were defeated a bunch. It goes in the js/plugins folder of GT, overwrite the one that's already there.
2. If you've done this correctly, the SECOND time you return to Haven in the intro, a scene should trigger as you walk past the alley next to the hotel.