Aw, I really like
Reuniclus!
Like, when the games came out, this Pokemon immediately stood out for me as one of the main reasons why I chose to play White instead of Black first! But yeah, it's a little on the slow side, but amazingly strong, and really durable! It's Magic Guard ability is sooo good so that it can negate any residual damage like from burns and poison, making it the perfect pivot for them!
Lilligant is another one of my favourites!
An awesome flower who has pretty impressive artwork! Like a floral woman, ohoho. I also like it's attacks like Giga Drain, Quiver Dance, and Sleep Powder which makes it a pretty potent sweeper if maybe you attach it with Hidden Power Ground or Hidden Power Fire! I use it on my White runs when I can too. Team wouldn't feel the same without her. :')
Another favourite is good ol'
Mienshao, a great Fighting type!
I really love the artwork; like an advanced monk! It's also really fast, speed wise, and it has really strong moves like Hi-Jump Kick, or Drain Punch for recovery in-game. Regenerator for it is also amazing. Competitive wise, it makes for a great scouter, or a member of Volt-Turn cores, utilizing U-Turn! Another pokemon who I regularly use for my Pokemon White runs!
Ohh another strong favourite of mine is
Volcarona.
It's really powerful once it gets a Quiver Dance going, using moves like Fire Blast, Bug Buzz, Fiery Dance, even Giga Drain from it's buff! A really strong special sweeper indeed! Love the artwork because it looks majestic-looking even as a sort of moth pokemon, colorful, and easy on the eyes too. I don't really get the chance to use one before post-game in the 5th gen games, however, because Larvesta takes too long to evolve, rugh. But when I get to, it destroys everythiiiing.
Haxorus is also really big and cool!
Like, I use one all the time while playing the original BW games, because it's really strong and especially outstanding with Dragon Dance and it's Mold Breaker ability! Like, I used this instead of going for Zekrom/Reshiram against N, and it managed to take the legendary pokemon down with just a slither of it's health left!
Another fav is
Meloetta!
Cool, cool and cute Meloetta. Relic Song is a cool move; can make the foe fall asleep, and it changes form! It's really a surprise when it does; it gets a boost of speed compared to the original, and Close Combat hits haaard. I don't really get much chances to use it but it still is adorable!
Last one is
Audino!
Super Audino. Super Audino is really helpful! Runnin' at the speed of sound, GOT ITSELF A SITUATION, IT'S IN A NEW LOCATION! But really, it's a blessing this thing exists cause it gives truckloads of EXP, but I also love how happy and sweet it looks; it's like.. the caretaker of pokemon, alongside Chansey and Blissey! Hadn't used it much in battle before, but I do admire it's talents. :]