Attacks » Return
When using Carnivine's "Return" attack, do I have to draw until there are five cards in my hand, or may I stop with less than five?
You do not have to draw any cards, but if you choose to do so you must end up with exactly five cards in your hand; no more, no less.
Source: Darkness Ablaze FAQ (2020-07-31), TPCi Rules Team (2020-08-13)
Attacks » Return
Can I use Dunsparce's "Return" attack with 6 or more cards in my hand?
Yes, it will do 10 base damage and you will not draw any cards.
Source: Unleashed FAQ (2010-05-13), PUI Rules Team (2010-05-13)