1. How does the card stand on its own? Is it good, bad, or have potential? Is it worth being played?
By itself, it's awful. Attacks are a bit overpriced and underpowered for an unevolving stage 1, and it's weakness is terrible with Luxray GL Lv X still around. Fighting resistance, while good, doesn't make up for its short-comings.
2. What popular metagame decks could it be used in?
None. See #4.
3. What combos can you use it with? How so?
Copycat and Judge. This will ensure that you and your opponent have the same card count in your hands. from there, it's not hard to manipulate your hand to match your opponent's, and even if you can't, said supporter cards will do the job for you.
4. Give it a rating, and explain why you have given it that rating. You can also rate the card by rating the thread itself (out of 5 stars).
2.5/5 Not that attacking for free isn't good, but this is completely inferior to Gyarados, which hits for 90 damage unbelted and can use Crobat G + Poketurn support (this would be a bit hard for Yanmega Prime which relies on Copycat and Judge for support, as these take deck space). Only when Gyarados rotates out might this bug-type see some play, but its future in the TCG is uncertain... probably unfavorable, even, as it only one-shots evolving basics and there's very little, if anything that is popular, that it can hit for weakness. Even in a format without Luxchomp dominating, Zekrom + Pachirisu CL will be sure to let Yanmega Prime know that its weakness will ALWAYS be terrible for as long as it's in format.
5. How's the artwork?
It's Prime artwork. What do you expect? 4/5