[Bug] Releasing your Last Eligible Pokemon and Replacing it with an Ineligible Pokemon Softlocks the Game

[Snailman11]

Describe the bug

In Challenges, if the Player replaces their last eligible Pokemon with an ineligible one, the game softlocks.
-Upon reloading the run, the battle is immediately counted as a loss, and if Switch is ON, the option to retry will be offered.

Reproduction

Start a Gen 4 Challenge Run, choose 1 Gen 4 Pokemon and as many non-Gen 4 but selectable Pokemon as possible. Catch until you have the option of replacing your last Pokemon, select YES, and softlock.

Expected behavior

The game shouldn't softlock.

Screenshots / Videos

Gen 4 Challenge

Releasing.Last.Challenges.Mon.mp4

Gen 4 Challenge, Replacing with Eligible

Eligible.no.Softlock.mp4

Session export file

No response

User data export file

No response

Additional context

[Bug] Softlock when only Eligible Pokemon in Challenges becomes Ineligible (Through evolving, Changing forms) #4724

Similar Bug

[Snailman11]

same issue with mono gen
#2116