What happens if you use Rayquaza GX's "Stormy Winds" Ability, but can only discard less than 3 cards from your deck? Do you get to attach a basic Energy card from your discard pile to Rayquaza GX or not?
If you can discard at least 1 card from your deck, you can use the Ability and attach a Basic Energy card from your discard pile. If you can't discard any cards, you can't use it.
Source: TPCi Rules Team (2018-08-16), TPCi Rules Team (2018-09-06)

Relevant cards

Note: All applicable cards may not be listed below.
SM7_109
SM7_160
SM7_177
SM7_177A
SM7_177A