Getting rockets 2nd and 3rd mons

Is it completely random? You guys have ttars, swamperts and ahit all i get is their first mon. Is there a mechanic I’m missing

It’s completely random.

For Grunts, most of the time you will get the first mon, but there is a small chance of getting the second, I think like 1 in 8.

For Team Leaders, and Jessie/James, you always get the first. If facing Giovanni, you always get the last.

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There is a list of catchable shadow pokemon, not all that you fight can be caught from grunts.

And not all that were catchable in the past are currently available to catch