Aha, Ninetales! I love this card. And this Pokémon, but without Drought it's not that useful competitively. Back to the card.
1. Ninetales (HGSS/CoL) is definitely a Team Player Pokémon, similar to Uxie (LA) or most closely Delcatty (PK). The Power is excellent even if you're using it solo because she uses Fire Energy anyways, but the attack is only mediocre - RRC for 60 is terrible in a format where knockouts for 1 or even 0 energy are common, and even without them, we have Reshiram and Zekrom coming up in Black and White that deal twice the damage for the same energy cost.
2. There aren't any metagame decks that utilize Ninetales, exactly, as Gyrados tears apart R decks, and SP Toolbox of any sort disrupts your setup as well as OHKOing Ninetales with Dragon Rush and a Crobat G drop. However, it's a critical part of the Charizard (AR) deck, and can potentially be useful in Speed Reshiram as well.
3. Since Ninetales discards energy, cards that recover Energy from the Discard Pile work well, such as Fisherman, Typhlosion Prime, or even the improved Energy Retrieval. Additionally, cards that get Energy from the Deck play nicely with Ninetales as well, Bronzong (SF) can put two Energy in your hand while getting rid of an unwanted card, and Cyrus' Conspiracy can fetch an Energy from the Deck as well as a Supporter to help you set up on your next turn. And obviously, Ninetales contributes to Charizard's (AR) Fire Formation Poké-BODY while providing the honorary dragon with continuous draw power.
4. 3/5. Roast Reveal is an excellent Poké-POWER, but her weakness to W and the overall speed of the format makes her more of a liability than a help at the moment. Pokémon Catcher isn't going to help matters much either, though she'll have a much better Pokémon to support in Reshiram.
5. I love the artwork, but then I'm biased as I love Ninetales. The original art from HGSS was better, though.