Gallade is an excellent card from the SW set. 130 HP is now the common for Stage 2s, +30 Weakness to Psychic (not too common anyways), no Resistance, and a Retreat Cost of 2. So he has your average Stage 2 stats.
Its first attack, Sonic Blade, is just awesome. For only a Fighting and Colorless energy, Gallade places damage counters on the Defending till it has only 50 HP left and forces a switch. This is great, as you can weaken their active to the point of KO by almost anything, and then force up new meat to again throw a Sonic Blade at to weaken it. Psychic Cut is also useful. Though it initially appears overpriced at 3 Energies for 60 damage, you are allowed to flip over your prizes to add 20 damage per prize flipped. This allows you to do that extra damage to KO the Defending Pokemon as well as gaining valuable insight as to what your prizes are. That, and Psychic Cut is an KO on anything you've hit with Sonic Blade previously, should your opponent have to bring it up.
Modified - 9/10 (A great card, especially if you combo it with Gardy Lv X. Also will be a dominant Blissey killer with Lake Boundary in play or something)
Limited - 8/10 (Providing you can get out the cards necessary to evolve it, it'll be an effective player. Its attacks are diminished in value though, as most Pokemon here have low HP anyways, and you only can flip over 4 prizes max)
Unlimited - 1.5/10 (No real reason to use it here imo, could be fun if you want to try though)