When I'd first gotten a hold of this egg in Pokémon Ruby, I thought it might have been something else. The old woman did say it held Wynaut, if I'm not mistaken, but I did not pay too much attention in my first run, which led me into believing that. I was expecting a Togepi to hatch from it, similarly to how things were in Gold, Silver, and Crystal.
When it hatched, I was definitely surprised, as the Pokémon was completely new to me. I did wind up keeping it on my team! After a bit of training, it had soon evolved into a Wobuffet. Personally, I didn't quite enjoy battling with this Pokémon, as it seemed to have made the process a bit complicating. Soon enough, however, I got used to it, and taught myself as to how Wobuffet is utilized.
In terms of appearance and whatnot, I'm a fan of Wynaut line, as it's unique in its own way. Wynaut's evolution is more or less a punching-bag to withstand hits and strike back harder, and the design represents this pretty well.