First you have to complete the Bonus rounds in 1 player and 2 player. They have to be gold medals. Then after you're done there will be a message saying: "There is a new horse in Redwood Forest" or something or rather. It's the white one.
What I did was get every horse I could get (21 in total) and then did the Bonus Rounds. That way I had a choice of which Stallion I could use.
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No
No, Horse Club only has one paddock and you only have one wild horse at a time, while Imagine Champion rider, has a breeding area, two paddocks and lots of wild horses, plus the horse you win is different!
You can find Marty in the common room.
Uh..Professor Oak..is... 1. In the introduction of the game.2. The Pokemon Lab in Pallet Town.3. On the PC as a menu option.4. Is in the room where you beat Gary as the champion.
I don't have it on PC but OF COURSE YOU CAN ITS ON PC