Eagun and Beluh from Colosseum = Ash and Misty

I definitely believe this:

My first clue was in Colosseum when Eagun fought with a high level Pikachu, his entire energetic and slightly ditsy personality matches that of Ash's - but there's a lot еще clues than that.

Eagun has seen Ho-oh twice in his lifetime, we also know this to be true of Ash, and his grandaughter, Rui, has an uncanny resemblane to Misty - suggesting his wife, Beluh, really is Misty. We know the game is set in the future because of gadgets such as the hover scooter, and the snag machine, and a real time is never specified.

One last thing - in the Anime, Ash's Пикачу always grows in levels, and then starts at the bottom again at the beginning of each new series - not unlike Eagun, who has a lv50 Пикачу in Colosseum - then has a lv10 Пикачу at the start of XD

It all adds up!

What?