How Do You Catch The Three Legendary Pokemon In Pokemon Pearl, And Were..

Easy peasy. Btw, there are more then 3. You mean by the 3 Mesprit, Azelf and Uxie. Well, Mesprit, once you get past the whole Palkia fiasco with Team Galactic, you go back to where they were catching them. If your not that far, then it'll come, just wait. You have to be past the Mt. Coronet thing. After that here whats next.

Mesprit: go back to lake Verity- in the cave in the middle of the lake. He'll run, but show itself before it does. You have to use uyour pokedex to track that one.

Azelf- Lake Valor(im currently there trying to catch it. Yea it's hard. Being difficult) make SURE YOU SAVE before you fight this one, just incase you mess up, you can restart. Take LOTS of ultras, dusk, timers, and even quick balls, I found out quicks work too. Nearly had it then it bust out.

Uxie- basically same as Azelf, but in Lake Acuity. Save, then battle.

There are also more, such as Giratina, this one I forgot it's name, but you can't go for it till you got the National Dex. It's in the Old Chateau, in the tv thats creepy, it's a electric/ghost I believe, but level 15. So yea, easy. Then theres heatran, and Cresselia. Cresselia you get by going to Fullmoone Isle, but thats later.

Good luck.

The three legendary Pokemon, Uxie, Mesprit, and Azelf, are found in the three lakes around Sinnoh, respectivly. Uxie and Azelf will fight when you meet it (they will be in the cave in the middle of the lake...my suggestion, use Dark Balls as you are in a cave) but Mesprit will leave as soon as you meet it. Afterwards, it will wander around Sinnoh. **I submitted a hint for finding Mesprit easier, but i'll tell you here: FLY to a city (after you encounter Mesprit for the first time and it's bieng tracked on your Poketch) and take a few steps. Mesprit will change it's location. If Mesprit is nowhere near you, FLY to the same city and take a few steps. Mesprit will move yet again. Do this until Mesprit is near you. When you encounter it, Mesprit will take off!! I caught Mesprit at night (so I used Dark Balls) and had Golbat use "Mean Look" to prevent it from escaping when I encountered it. However, Mesprit is fast so even with the Quick Claw my Golbat had, it took a while before Mean Look landed and I was able to catch Mesprit. Note: if you use a Golbat with Mean Look, do not let it faint if Mean Look lands! Otherwise, Mesprit will be able to flee.**

The three legendary Pokemon, Uxie, Mesprit, and Azelf, are found in the three lakes around Sinnoh, respectivly. Uxie and Azelf will fight when you meet it (they will be in the cave in the middle of the lake...my suggestion, use Dark Balls as you are in a cave) but Mesprit will leave as soon as you meet it. Afterwards, it will wander around Sinnoh. **I submitted a hint for finding Mesprit easier, but i'll tell you here: FLY to a city (after you encounter Mesprit for the first time and it's bieng tracked on your Poketch) and take a few steps. Mesprit will change it's location. If Mesprit is nowhere near you, FLY to the same city and take a few steps. Mesprit will move yet again. Do this until Mesprit is near you. When you encounter it, Mesprit will take off!! I caught Mesprit at night (so I used Dark Balls) and had Golbat use "Mean Look" to prevent it from escaping when I encountered it. However, Mesprit is fast so even with the Quick Claw my Golbat had, it took a while before Mean Look landed and I was able to catch Mesprit. Note: if you use a Golbat with Mean Look, do not let it faint if Mean Look lands! Otherwise, Mesprit will be able to flee.**

Hey,as to the Mesprit,Azelf,and Mixe question,you find them at the lakes but like Latios,Latias,and the three legendary dogs,Mesprit,will run off.

The legendary trio? One on each lake mesprit:lake verity but then he runs away you have to find him in the wild,uxie:lake acuity,azelf:lake valor