OK here we go. If you have the "marking map" poketch app (the one with the star, heart, etc.), you'll be able to track mesprit's movements. My suggestion is to stay in Jubilife, and take the road up repeatedly. The mesprit will begin to patternize, and appear north of Jublife
Mesprit is #481 in the national pokedex, and it is a Psychic type Pokemon.
sinnoh pokedex: mesprit national pokedex: dratini
#481
You get a Pokemon entry in your pokedex.
Yes They Are
Catch them?
Mesprit Uxie azlef are the three other legendary Pokemon but not very good
there is nothing you really need to do with azelf, uxie, and mersprit. you just need to see them to complete your pokedex.
THE LAST FIVE POKEMON IN THE POKEDEX IN DIAMOND IS UXIE MESPRIT AZELF DIALGA AND PALKIA. NOTE: PALKIA CANT BE CAUGHT UNLESS YOU TRADE WITH SOMEONE.
Dialga, Uxie, Mesprit, Azelf, and probly Arceas.
To add caterpie to the pokedex in Pokemon platinum, you must first get the national pokedex, and then migrate him from pal park (if you havent already done that), and finally catch him in pal park and he or she has been added to your pokedex.
dalaga(dimond) or palkia(pearl) and azlef mesprit and uxi(sorry about the spelling)