More tests with Truant:
For MacChaeger: when an Illusioned Rayquaza or Necrozma Mega Evolves / Ultra Bursts, the custom text and animation plays that normally accompanies it. That is "<player>'s fervent wish has reached <disguised Pokemon from Illusion>", "Bright light is about to burst out of <disguised Pokemon from Illusion>", and "<disguised Pokemon from Illusion> regained its true power from Ultra Burst".
- Giving Truant to Ultra Necrozma the turn it Ultra Bursts results in the same behavior as Megas; Entrainment Durant passing Truant on the turn it Ultra Bursts does cause it to immediately loaf around.
- A hacked Groudon with Truant as its base Ability -> Primal Reversion -> is NOT loafing around (this is expected, because it doesn't have Truant as Primal Groudon).
- Having Durant Entrainment Pikachu -> Smeargle transforming into Pikachu -> Smeargle NOT loafing around the following turn
- Smeargle transforms into Pikachu -> Durant Entrainments Smeargle -> Smeargle NOT loafing around the following turn
For MacChaeger: when an Illusioned Rayquaza or Necrozma Mega Evolves / Ultra Bursts, the custom text and animation plays that normally accompanies it. That is "<player>'s fervent wish has reached <disguised Pokemon from Illusion>", "Bright light is about to burst out of <disguised Pokemon from Illusion>", and "<disguised Pokemon from Illusion> regained its true power from Ultra Burst".