i heard that for people that finished Bee's quests before the rewards were updated (we got Mawilite instead of Scizorite), there should be a Scizorite in Victory Road? but i unfortunately have not been able to find it.
as for Decidium Z, i posted about this issue a long time ago, and it seems it still wasn't fixed? the mulch guy gave me venusaurite, but his assistant doesn't give out the Decidueye Z crystal. he just behaves as if he's already given it to me.
edit: found scizorite in the room in victory road with charlotte's four carts. i'll just assume the decidueye crystal is still bugged on my end.