Because that would hand the initiative entirely to the opponent.
Pokémon of other types could not flee into the Spirit World. They could only seize a chance to counterattack when a Ghost-type Pokémon made its move.
Aihara Take had ordered Heracross to launch a fierce assault the instant the match began precisely to deny Mimikyu any chance to flee into the Spirit World.
Yet it had still happened.
"Heracross!"
Heracross stood rooted to the spot. Since it had no idea when Mimikyu would appear, it did not dare use any status moves and could only remain fully alert.
At the slightest disturbance nearby, it could react at top speed.
The arena was completely empty aside from it, making it look a little like it was playing mind games with the air...
Especially since a full minute had passed and Mimikyu still had not appeared, leaving Heracross feeling rather awkward.
If this had been a life-or-death battle, Heracross could have gone looking for trouble with other Pokémon or even attacked Roy. But this was a competitive match, so it could only stay put helplessly.
Of course, competitive battles had rules restricting the shameless tactics of Ghost-type Pokémon as well.
"Competitor Roy, there is only one minute remaining," the referee reminded him.
During a match, Ghost-type Pokémon could flee into the Spirit World to recover their strength, conceal their true body, and launch surprise attacks and assassinations. That was their racial advantage.
However, after entering the Spirit World, their total time without attacking could not exceed two minutes.
Roy nodded to show that he understood.
He used Aura sense to feel Mimikyu's emotions, confirming its progress...
Ten seconds later, Roy's eyes shifted.
...It was coming.
At the same time, a crack suddenly appeared in the air two meters behind Heracross's left side.