Rotom-Fan would be better at using this set.
Why not Xatu?
The main reason why Xatu isn't as effective at using this set is because it is weak to so many common types, such as Electric, Dark, Rock, and Ghost. This is especially troublesome because Xatu doesn't have the bulk to cope with these weaknesses.
Rotom-Fan, on the other hand, is only weak to 2 types (none of them are 4x) and it has 5 resistances / 1 immunity (all of which are common attacking types). Rotom-Fan also has slightly better bulk with 50 / 107 / 107, while Xatu only has 65 / 70 / 70 bulk. Finally, Rotom-Fan also gets better Sp. Atk.
EVs: 68 HP / 252 Sp. Atk / 188 Speed
Timid Nature (- Atk, + Speed)
- Air Slash
- Thunder Wave
- Confuse Ray / Pain Split
- Volt Switch / Thunderbolt
Why that EV spread?
The EVs in speed / speed-boosting nature is meant to outspeed Adamant Kangaskhan and Adamant Sawk (both of which are big threats).
Maximum investment in Sp. Atk (along with Life Orb) is needed to muscle pass through walls / tanks.
The rest is invested in HP to boost its bulk.
Why those moves?
Air Slash + T-Wave is needed for paraflinching (and you did want those two moves).
Confuse Ray isn't as viable on Rotom-Fan, so I suggested Pain Split as another option because Pain Split is Rotom-Fan's only form of recovery.
Volt Switch is meant for grabbing momentum, while Thunderbolt gets a powerful STAB attack.
Hope I helped!