19

With the gym system overhaul, the old prestige system involving training gyms was removed. However, there is/was a badge associated with training friendly gyms via battling them called Ace Trainer.

ace trainer

Is it no longer to make progress or achieve this medal? Is there some new way to earn this medal?

23

With the release of trainer battles, the Ace Trainer medal is now able to be earned again. By opening the “Near By” menu and swiping left, you can choose to battle and train against any of the team leaders. Once the battle is over, the progress to the Ace Trainer medal will increase.

Looking to learn the ropes or sharpen your budding battle skills? Team leaders Spark, Candela, and Blanche are eager to test your bravery! [...] Work toward earning an Ace Trainer medal!
(emphasis my own)


Unfortunately, you are no longer able to earn this medal with the new gym system, but it will stay in your achievements list for historical purposes

Niantic Support

What’s going away

...

Ace Medal: This achievement is also retiring. You’ll still keep the Medal but, since you can no longer train at Gyms, you won’t be able to make further progress on it.

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