What determines what pokémon is going to be switched in while using phasing moves?

Question

As in, the Pokemon that replaces the forced out Pokemon via Roar, Whirlwind and Dragon Tail.

Comments

I am very sure that it's most likely RNG or something, as it doesn't really seem to follow a pattern.

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RNG is the cause of this

Answer 1

Roar:

Now, when in battle against a Trainer, Roar will force a switch with a randomly chosen Pokémon from the Trainer's party.

Whirlwind:

Now, when in battle against a Trainer, Whirlwind will force a switch with a randomly chosen Pokémon from the Trainer's party.

Dragon Tail:

Dragon Tail inflicts damage. Additionally, it will automatically end wild Pokémon battles or, in a Trainer battle, it will switch out the opposing Pokémon to the next Pokémon in line that has not fainted.

Circle Throw:

Circle Throw inflicts damage. Additionally, it will automatically end wild Pokémon battles or, in a Trainer battle, it will switch out the opposing Pokémon to the next Pokémon in line that has not fainted.

tl;dr: Roar and Whirlwind are determined randomly, while Dragon Tail and Circle Throw go to the next Pokemon in the party.

Source: Their Bulbapedia Pages

Comments

Thanks Scraf.

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You're welcome, man.

Adding in Circle Throw.