Tier 10

[spookysocialist]

Yeah I'm like 99% sure Zapdos isn't legal, the only legal legends I'm aware of are Jirachi, Celebi, and Regigigas (and the banned Sinnoh box trio).

Manaphy (and phione i guess) is available. Its only moves are tail glow, bubble, water sport and charm.

Edit: So if the below is correct, ho-oh, lugia, tornadus, thundurus, and landorus can all be obtained at or below lvl10. The only one who looks like it might make an impact is tornadus who has hurricane/hammer arm/tailwaind, and maybe ho-oh with a stab weather ball in sun.

 

[Cresselia92]

If people wish to know which Pokémon can be obtained at Level 10 or less, this link could be helpful:

http://www.serebii.net/games/pokeball.shtml

 

[Illusio]

To add on to Darklatias92's post, I have built a list of all fully-evolved/somewhat viable legal Pokemon in Tier 10 here.

Let me know if I missed any Pokemon. I might update it to show legal abilities/moves as well.

 

[Jajoken]

Illusio's list was very helpful -- here are some Gen 1 sets that may prove successful.

Pikachu

Pikachu @ Light Ball
Ability: Lightning Rod
EVs: 36 HP / 236 Atk / 236 Spe
Adamant/Jolly Nature
- Fake Out
- Quick Attack
- Volt Tackle
- Reversal

Volt Tackle is one of the most powerful moves available at such a low level, and Reversal is there for filler. Fake Out + Quick Attack is a great cleaning tactic, especially if running Adamant.

236+ Atk Light Ball Pikachu Fake Out vs. 36 HP / 0 Def Honchkrow: 13-16 (29.5 - 36.3%) -- 35.4% chance to 3HKO
236+ Atk Light Ball Pikachu Quick Attack vs. 36 HP / 0 Def Honchkrow: 13-16 (29.5 - 36.3%) -- 35.4% chance to 3HKO

Pikachu Belle can't use Volt Tackle, but you can use it if you'd rather settle for Thunder Punch. Raichu also has Thunderbolt, which is worth noting, but otherwise seems irrelevant.

Clefable

Clefable @ Leftovers
Ability: Unaware
Level: 10
EVs: 236 HP / 36 SpA / 236 SpD
Calm Nature
- Wish
- Healing Wish
- Aromatherapy
- Disarming Voice

Solid Unaware cleric set that can stop the Nasty Plot sweepers that people have mentioned

236 SpA Life Orb Mismagius Ominous Wind vs. 236 HP / 236+ SpD Clefable: 13-17 (27 - 35.4%) -- 94.9% chance to 4HKO after Leftovers recovery
236+ SpA Togekiss Air Slash vs. 236 HP / 236+ SpD Clefable: 15-18 (31.2 - 37.5%) -- 0% chance to 3HKO after Leftovers recovery
(I don't know what spread Toge uses, so I went with Modest Leftovers)

Physically defensive stops Honchkrow...kind of. If you come in after a Moxie boost, you can eat one Brave Bird and kill with Disarming Voice (if low enough) or rack up some recoil with Wish. Also, there is not a single Fairy on the viability rankings (though Togekiss should be there), so Clefable would be much appreciated in the metagame. Magic Guard is also available, and you get Healing Wish, which is nice. (EDIT = Forgot it can't use Protect)

Wigglytuff

Wigglytuff @ Choice Band
Ability: Frisk
Level: 10
EVs: 236 HP / 236 Atk / 36 SpD
Adamant Nature
- Play Rough
- Double-Edge
- Wake-Up Slap
- Body Slam

Okay this is probably pretty shitty but I thought it would be amusing haha. Your level 10 offensive movepool isn't too awful, so make use of that rare high-power Fairy + Normal STAB.

Cloyster

Cloyster @ Focus Sash
Ability: Skill Link
Level: 10
EVs: 236 Atk / 36 SpA / 236 Spe
Naughty Nature
- Shell Smash
- Icicle Spear
- Rock Blast
- Hydro Pump

People have mentioned it, but Cloyster needs a rank. Very strong, and even has Toxic Spikes and Rapid Spin as alternate options.

Exeggutor

Exeggutor @ Life Orb
Ability: Chlorophyll
Level: 10
EVs: 36 HP / 236 SpA / 236 Spe
Modest Nature
- Giga Drain
- Leaf Storm
- Moonlight
- Ancient Power

To be paired with Ninetales. Grass + Rock is pretty decent coverage, Moonlight restores 2/3 HP in sun, and Modest Life Orb Leaf Storm is pretty good and breaking down the opposition. Nature Power gives you Tri Attack, which is solid for neutral damage.

Ditto

Ditto @ Choice Scarf
Ability: Imposter
Level: 10
EVs: 252 HP
Serious Nature
- Transform
-

Ditto loses nothing in this metagame. Everyone knows what it does, and I hold to the opinion that Ditto should at least be ranked D rank in any tier it's allowed in due to its unique niche.