1. How does the card stand compared to other Trainers/Supporters/Stadiums? Is it good, bad, or have potential? Is it worth being played?
I think this is a great alternative to Pokemon Collector, both financially and play-wise. I think people underestimate this card because it's a flippy card, but honestly, it's a lot better than it gets credit for. If you're going to play hand refreshers like PONT and Juniper, or you use a Supporter-reliant deck, this is possibly better than Collector as now you don't have to use a Supporter and you'll draw some basics when you use cards like that anyways, IMO.
2. What popular metagame decks could it be used in?
I don't know what particular deck you could use it with, but any deck that relies a lot on hand refreshing (which is pretty much any deck) could use this to basically get 1, maybe 2 free Basics before throwing your hand away. It works will with Supporters, and every deck uses Supporters. Dual Ball is not a go-to card, but it's more so a card you can use to supplement your bench.
3. What combos can you use it with? How so?
You can use it with any card you would with Collector. Maybe with slightly less efficiency, but you still have a 75% chance to get at least one Pokemon, which you can send back with Communiction. Can also be used with Junk Arm, which, while usually would be undesirable, Junk Arm is all about situations, and you would have one more option. Also has more natural synergy with Supporters.
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).
Depending on the deck, it could be a 3.5 to a 4.5. For decks that require elaborate setups like Reshiphlosion, this might be a dodgy card, but for decks that can get off to the races rather easily like my deck (KingBuzz) and can get going with just two Pokemon and is very reliant on Supporters, this card is wonderful. It really helps me add to my bench, and plays it's role of a luxury Pokemon searcher perfectly. Like I said, it's not a go-to card: Collector is a go-to card, but I have go-to cards, and for decks that NEED to use their once-a-turn Supporter on something else, this should be a no-brainer. If this card said search your deck for one basic Pokemon, this card would be easily be a 5, but flipping, even with the possibility of two heads, leaves the possibility of two tails, which is why I can't give this card a perfect raring: the mathematical mechanics are simply less consistent, even though the average number of Pokemon searched out is the same.
5. How's the artwork?
The artwork is great! I especially love the CL artwork, that appears to have the SportsCenter logo in the background. I call it the SportsCenter art. Definitely a 5 there!