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Sliphroad更新されてた
2番目ポケモン手に入れられる確率は15%とのこと

When preparing to face Team GO Rocket, each Grunt's gender + dialogue can be used to predict their potential lineup(s)!
Also, there's an 85% chance the Grunt leaves behind their 1st Pokemon (if both 1st & 2nd are Shadow eligible).
Details: https://thesilphroad.com/science/team-go-rocket-battle-line-ups-shadow-pokemon-rewards/