and how to trade items
dream mist
trading a pokemon holding tat item or just putting it in secret base mailbox
that was fast
edit^
also welcome
thanks
More specifically, using Dream Mist in Gaea Town (post-game area) or by using the friend safari. (Therefore, HA deltas can only be obtained post-game)
There is also a high chance that Pokémon in the friend safari have one.
iiii