Does the pink vial reset all the skills ie: you lose all the turns and AP you've put into them or does it just remove the AP points you've used?

Using a pink vial will reset the used Ap's and also all used turns for training will be reset into Ap's.

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Raoul the Unknown (8125) said
Using a pink vial will reset the used Ap's and also all used turns for training will be reset into Ap's.

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After the Pink vial is used, you will be refunded all of your Stats minus 20 (5 ap is left in each stat.

If you had 4426 stat points total. Then you would have 4406 ap to be used.
and 5 in strength,stamina,agility and endurance.