I know Pastel Veil prevents poisoning but Anticipation is very good too, maybe even better than Pastel Veil since
1. Toxic isn't a Tm is SwSh anymore, so its way rarer than in previous generations
2. Most Toxic users are poison type, and who in their right mind would send out a poison type against a 100 base atk part psychic type?
By the way, stay tuned for the HA Galarian Ponyta mystery gift event that is happening on May 28th. You can also snag some rare PokeBalls as well