Keep Expert Belt. Non-attacking moves should all be AC'd because they don't aid the main purpose of this set, which is to lure shit out and kill it.
Here's what the set should look like imo
name: Expert Belt Lure
move 1: Hydro Pump
move 2: Secret Sword
move 3: Icy Wind
move 4: Hidden Power Electric / Hidden Power Bug
item: Expert Belt
evs: 4 HP /252 SpA / 252 Spe
Hidden Power Ghost, Surf, and Mystic Water in AC.
Icy Wind + HP Electric covers everything "but Celebi", although if you can predict its switchin and its weakened a bit, it loses anyway. Expert Belt is needed to secure the 2HKO on Latias with Icy Wind after Stealth Rock, iirc.