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Because Mega Lucario ex and other Mega Evolved Pokmon are replacements for their non-Mega Evolved forms, they have to follow the evolution sequence in Pokmon TCG

With so many sets in Pioneer, the chance that the energy core is just the best way to build decks to such an oppressive extent is much less likely than it was in Standard because ultimately there are still only two sets that contain these energy cards

If you choose the last mode and don't put a sticker on anything, you still chose that mode

Id consider it non-canon from a perspective of cards that are printed, but I think we can agree that its canon if anybody wants to consider it so for the convenience of entertainment