Im currently retrofitting in the rival. Putting him in events. He will have stolen all 3 jotoh starters. in the first battle you'll fight all three, but later he'll only use the starter that would be strong against the eevee form you're currently in.
vaporeon -> chikarita
jolteon -> chikarita (thunder is not effective on grass :/ )
espeon ? (random, or croconaw, because he has Crunch)
umbreon ? random.
leafeon -> cyndaquil
glaceon -> cyndaquil
Text only updates are boring.
Heres some 3rd gen sprites that I devamped a while ago.