1. I personally feel as though this Lucario is far too overlooked. In a day when people quickly fear Lost-Gengar decks, it could be a key player in a Mew Prime deck, since it attacks as easily as a Double Colorless Energy and 1-shots Lost-Gars with 5 in the Lost Zone (or 4 and a belt)
2. As I mentioned, with Mew Prime, either as a tech or with Mew Prime as the tech.
3. Aside from the Mew Prime that's been mentioned ten times, you could also mix in Palkia G LvX to toss out your used Uxies, and even do some Mesprite drops to cripple your opponents early game, and throw them to the Lost Zone to power up Lucky even more. The great thing is if you're not facing a Lost-Gengar deck, you can keep throwing them away to mass up ridiculous amounts of damage that you can set up in a single turn if one gets KO-ed (BTS+DCE)
4. I rate this 4.5/5, only because of its HP. I feel this card is severely overlooked as a competitive card, but the HP could still give it problems. Then again, every good deck has its problems.
5. 5/5 score for the artwork. The stylized graphic is quite invigorating for being quite possibly the best Lucario released, when used strategically. Also, it looks like it could be a snapshot taken from a Super Smash Bros Brawl scene.