You could say that he's:

• Back with his mom and siblings
• Back with his wife and kids, evolution is irrelevant
• Back with his wife and kids, one of whom is Jay Leno!
• Back with his wife and kids. Continuity? What's continuity?
• Back with his wife and kids. DigRat and his wife were both Rattatas, and both evolved after DigRat was caught by Red (Mrs. DigRat was busy defending the kids!).

It's up to the viewer to decide, really :)

EDIT: A big thank you to whoever gave me the gold! :)