Heavy Helmet (Mega Rising B1-219)

If the Pokémon this card is attached to has a Retreat Cost of 3 or more, it takes −20 damage from attacks from your opponent's Pokémon.

The chance this card fills each slot in a pack. Estimated packs is the average number of packs you'd open to pull one. It counts every slot in the row and how often that pack type appears, and Overall adds up every way to pull it.

Mega Gyarados

Pack type	Slot	Pull rate	Estimated packs
Regular pack 94.711% of packs	Card 4	2.727%	39
	Card 5	1.818%	58
Pack with a bonus card 5.238% of packs	Card 4	2.727%	700
	Card 5	1.818%	1,050
Overall			22