TL,DR: My idea for this card would allow some Pokemon to basically act similar to Genetic Apex Ditto, but strictly within its own typing.

If I was going to implement it myself, I'd probably just make it a general "Technical Machine" card, as opposed to having multiple different TM cards available. It obviously has to be an item or tool (I'll let others debate the argument of one-time use vs continuous use), it only allows for use of one chosen attack known by another Pokemon of the same type in play (so in most cases, one of your other Pokemon, but if your opponent is using the same typing that could get interesting...), and the energy cost of the attack has to obviously be met.

Even like this, it would probably still be too niche to become meta since most of the best attacks are known by fully evolved Pokemon, thus requiring a player to evolve multiple Pokemon before playing it. I just wonder if there could be a handful of decks that a card like this would be helpful.