I don't think there is really any high level rain footage around. Rain and Noob are incredibly overpowered in MKT for PSX. They break the game. If there was high level play in MKT out there somewhere, Rain and Noob would probably be banned along with the bosses.
As far as combos that would be used. Basically you'd just go for his infinite. You can start it off the rain ball, the lightning, off a roundhouse, probably off his autocombo, off antiair HP or LP. Its part of the reason why he is broken.