Don't take me serious--I'm sure that I'm 100% wrong...
May has the following Pokemon her team:
Combusken: Dual Fire/Fight
Muchlax: Normal (It's evolves into Snorlax, doesn't it?)
Squirtle: Water
Now Eeve has the follow evolvations--I'm stilling with the original
"eons"--I'm skiping Flareon and Vapereon for one reason--she has
gotten a fire and water Pokemon as see above here.
Jolteon
Pros: Can help Pikachu shock TR.
Cons: Could shock Ash and co as well. Could be targeted by Team Rocket, if it's thunder attack is as power as Pikachu's are.
Logic: May doesn't have anyone with thunder attacks on her time-- and she may need to stop TR with out Ash or Brock around.
Odds: 5 in 10
Umberoen
Pros: Very beatiful
Cons: Could make more trouble for the group then TR.
Logic: Not good. May is put of the hero side with Ash, Brock
Misty and Max.
Odds: 1 in a million.
Espeon
Pro: Very beatiful. Can use pyshic attacks.
Cons: Doesn't look like any.
Logic: Pretty good--and May's a happy-go-lucky--unless it's deals with Harvey or TR.
Ratings: 8 in 10
As for new "Eons"-type, we just have to wait for "Pearl and Diamond" to be unleased.
Logging off,
Dr. Thinker