I can't use z move on My shadow heatran via typing command

[safe nimbus]

Hey! I don't know why but i can't use the z move (Inferno override) via the typing command (P!zuse 1 or .zuse). It seems like a bug or glitch.

??

I can only use it via buttons

P!i

[cyan reef]

Level 100 Shadow Heatran "Rare - fav"

Max Level
Types: Shadow | Fire | Steel
Holding: Firium Z
Nature: Modest
Ability: Flash Fire
HP: 289/399 - IV: 26/31 - EV: 252
Attack: 218 - IV: 22/31 - EV: 0
Defense: 200 - IV: 25/31 - EV: 0
Sp. Atk: 435 - IV: 16/31 - EV: 252
Sp. Def: 193 - IV: 18/31 - EV: 0
Speed: 199 - IV: 26/31 - EV: 0
Total IV %: 71.51%
Total EV : 504/508

Displaying Pokémon: 14447/14447 - Use P!back and P!next to cycle through your pokémon!