Answer 1

There's eight. They are:

• Moltres, Zapdos, Articuno (legendary birds)
• Raikou, Entei, Suicune (legendary beasts)
• Regirock, Regice, Registeel (legendary golems)
• Uxie, Mesprit, Azelf (lake guardians)
• Thundurus, Tornadus, Landorus (Kami trio)
• Groudon, Kyogre, Rayquaza (Weather trio)
• Dialga, Palkia, Giratina (Creation trio)
• Zekrom, Reshiram, Kyurem (Tao trio)

There are also the Three Musketeers (Virizion, Terrakion, Cobalion), however they are not technically a trio. There are also numerous duos, which are listed Here.

http://bulbapedia.bulbagarden.net/wiki/Legendary_trios

Comments

thanks

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Damn you fizz!!!

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@ Lucario: Glad to help!
@ TBB: I thought there'd be some competition there :P

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Dude give my fingers a break were the only answers on the site :P

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:P (filler)

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Show your face on chat

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Lol u forgot cobalion Virizion and terrakion

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I added them though they are not actually a trio due to the presence of the semi-member Keldeo.

Answer 2

Kanto- bird trio of articuno, zapdos, moltres
Mew duo of mew and mewtwo
Johto- beast trio of raikou, entei, suicine
The tower duo of lugia and ho-oh
Hoenn- golem trio of regirock, regice, registeel
Weather trio of groudon kyogre and rayquaza
Sinnoh- guardian trio of azelf, mesprit, uxie
Creation trio of dialga palkia and giratina
Unova-kami trio of tornadus, thunderus, landorus(including alternate forms)
Sword of justice trio of cobalion, terrakion, and virizion
Tao trio comprised of zekrom reshiram and kyurem

I realize I put in the duos but only to show you all the Pokemon

Comments

Also keldeo might be considered part of the swords of justice