https://gamerant.com/pokemon-legends-z-a-mega-stone-fix-patch-notes/
New Pokemon Legends: Z-A Update Fixes Mega Stone Bug
Pokemon Legends: Z-A just got a new update that fixes a problematic bug affecting Mega Stones for Greninja and Delphox, and new rewards are available.
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https://www.techtimes.com/articles/313037/20251128/pokemon-legends-z-patches-mega-stone-bug-ranked-battles-now-guarantees-rank-rewards.htm
'Pokémon Legends: Z-A' Patches Mega Stone Bug in Ranked Battles, Now Guarantees Rank Rewards
mega stone buglegends zranked