1) Ban Tangela and Yanma
I really didn't want to come to this, but I must agree that both of them are broken.
Tangela
This thing is obviously one of the most broken things in the tier. STAB Life Orb Solarbeam will OHKO anything that doesn't resist it, Chlorophyll boosts its speed to outspeed most Choice Scarf users, Ancient Power deals with Bug- and Flying-types and has a small boost chance that could break games in half, and Sleep Powder just eliminates from the battle anything that could be threatening to it (not that anything bar Goomy is really threatening to Tangela, as they're all 2HKOed at worst by any of its moves). But that's not his only set, as the Leaf Storm Regenerator one is one of the deadliest Hit-And-Run attackers in Little Cup, obliterating things with a Life Orb-boosted Leaf Storm, and switching out, regaining any health lost in the matchup with Regenerator. It can also use Knock Off and Sleep Powder, guaranteeing that nothing will survive its hits. It also hits a decent 15 speed tier, enough to outspeed most defensive pokémon in the metagame. However, even if it is matched up against a faster attacker, it will probably tank the hit, thanks to its base 115 defense.
Yanma
If complex bans were allowed, I'd only ban the Compoundeyes set, but it's not possible.
Yanma has two effective sets: Speed Boost, and Compoundeyes. The Speed Boost set is an excellent late-game sweeper, able to clean most offensive and weakened teams, thanks to Life Orb-boosted attacks and a powerful STAB move in Bug Buzz. No Choice Scarf user can outspeed it, however, Priority hurts it. It really depends on its last moveslot either, depending on what combination of Hidden Power Ground / Hidden Power Ice / Protect / Giga Drain / Hidden Power Fire you used. It's really good, but not broken.
The Compoundeyes set is one of the biggest momentum grabbers and defensive breakers in LC, notably thanks to the combination of Hypnosis and U-turn, allowing it to easily make a defensive pokémon switching in fall asleep, and gain huge momentum instantly with U-turn. It isn't an offensive slouch either, as it still has Bug Buzz and Air Slash to easily clean late-game with 20 speed. Sleep is really crippling in Little Cup, even with the nerf, and Berry Juice allows it to basically have a second life if it mispredicts (or gets hit by priority). It is effectively uncompetitive, as you are not rewarded for predicting your opponent's moves, but always punished, thanks to Hypnosis and U-turn, always giving the momentum to your opponent.
It's broken.