Is there any way to tell if a Pokemon is about to run away or is prone to running away?

Over the last few days I've had a few Pokemon run away while I was trying to catch them. Sometimes a Pokemon runs away after a few tries while others go for much longer. I have berries now so I can try to keep around longer, but I don't know if and when a Pokemon will run away.

Is there a a way to tell when Pokemon are about to run away or are more likely to run away?

Solution 1:

Pokemon give no visual indication of being about to run away.

However, Pokemon such as Abra are (still) almost guaranteed to run following a failed capture attempt. The chance any given Pokemon will run away on the first throw (without any sort of modifier) is given in the BaseFleeRate variable from the decoded ProtoBuf file.

Additionally, Pokemon with orange or red rings have a higher initial chance of running away. All Pokemon will run after enough turns have progressed, as the chance of a run increases each unsuccessful turn.

Solution 2:

Every species has a probability of running away. Just look for BaseFleeRate in the decoded game file. A Pokémon with BaseFleeRate of 0.99 (like Abra) has 99% probability to run away after an unsuccessful throw, whereas a Metapod with BaseFleeRate 0.07 is much more likely to stick around while you waste your PokéBalls perfecting the curve ball.