"Fantastic Four"
Prerequisite: Fantastic Four team ability

All friendly characters with the Fantastic Four team ability have the following team ability instead of the Fantastic Four team ability:

Any member of this team may replace its defense value with the defense value of any other member.

If i were to use this card on a team with the FF and also had wild card team characters on it, would the wild card team character gain the new ability since the card changed the FF ability or would the wild card team character only get the old FF ability?

This was addressed in the FAQ. Yes, wildcard team members can copy alternate team abilities.