Gen III/IV only moves!

If you go on Serebii there is a section saying “Gen III & IV only moves” maybe there Shards could be used to teach these moves, since quite a few Pokemon lose some exellent moves from the moves being removed as TM’s like Silver Wind on Kricketune would be exellent and Iron Tail on Luxray. This would likely work like the Egg Move system with it been random, but it would probably be more appealing if you can choose since like every Pokemon has that chance of learning Endure or Natural Gift when there is only 1-3 good moves there on average.

It’s just a suggestion but it would be intersting to see it implemented since people have these useless shards.

Other ideas of payment for this:
Money
Heart Scales
Big Mushroom

New Ideas:
Prism Scale (Changing it’s use from evolving Feebas)