Meant to post this yesterday but I forgot. Hope I can post it today if that's cool.
1. How does this card stand on its own (analyze the HP, attacks, Abilities, etc. of the card)?
Okay, one at a time. 140 HP. Quite good. Stage 2. Necessitates Rare Candy, but that's no big deal. {W} weakness, seen only really in Kyurem, which only really irritates it. 2 Retreat. Again, no big deal. The attacks. {R}{C} for 40+Burn OR 70. Either of those effects is quite desirable, and can serve to hold you off for a bit while you power up Flamethrower, which is what you really want; for {R}{R}{C} plus a discard, it hits 130. Now, 130 is an odd number; no Pokemon card to date has an attack with that base power other than Blaziken. Fortunately for Blaziken, 130 is this format's magic number for OHKOing; it OHKOs every basic non-EX, and the cost for the attack isn't taxing either - you can use it once every turn if you have the Energy.
2. What cards, if any, does this card combo with?
Just run some Energy Retrieval and you'll be fine. Plus, we have Emboar, so it's not like he's without Energy acceleration. Really, his only issue is getting the Energy out onto him quickly, but Emboar can help that, and Energy Retrieval can get them back. The only attacks that really OHKO this guy are the big attacks of Resh, Zek, and Kyurem EXs, which aren't often seen. Then again, EXs are pretty common, but at the very least, Flamethrower will leave a nasty dent in their HP.
3. What role does/could this card have in the metagame?
Getting rid of: Reshiram, Zekrom, Terrakion...in short, it can get rid of any Pokemon that isn't an EX, and can only really be 2HKO'd while Blaziken just OHKOs them back, thus tipping the prize trade in your favor. I wouldn't be surprised to hear that Blaziken+Emboar becomes some super-legit deck this format or next.
4. Give it a rating (out of 10), and explain why you have given it that rating.
9/10. It has hidden potential that still needs to be tapped, but so far people are all caught up with their Darkrais and Terrakions that they overlook this little wonder. If I had the cards, I'd build this.