What is the best national dex team with no legendarys in Sinnoh?

It depends. My Team Normally consists of;

Salamence

- Level 100

- Fire Fang [Fire]

- Dragon Breath [Dragon]

- Crunch [Dark]

- Fly [Flying]

Shaymin

- Level 96

- Psychic [Psychic]

- Magical Leaf [Grass]

- Secret Power [Normal]

- Giga Drain [Grass]

Kingdra

- Level 94

- Waterfall [Water]

- Surf [Water]

- Hydro Pump [Water]

- Twister [Dragon]

I normally keep a Grass Type, a Water Type, and a Pokemon that knows a Fire Move.

I dont know if this helped. But I hope it does.

-Celestial Illusion