Is there a point where there is no need to upgrade?

I’ve got both Paramoloch and Tragodistis ready to go to 21 and Monolometrodon ready to go to 25 but can’t see the point? Mono is on my team but the others are benched! Would cost 50k to update Para or Trag and 90k for Mono…

They would both gain a decent amount of xp but can’t see them helping that much in a battle team… Thoughts?

My rule these days is save the coin unless they are on (or are likely to be on) your team or you need them to unlock a hybrid (which doesn’t apply in the instances you quote).