Sorry! You can't!
if you want Entei in Pokemon Diamond/Pearl you'll need a Pokemon FireRed/ LeafGreen that you started out with Bulbasaur. In FireRed/ LeafGreen if you started out with Bulbasaur [Grass-Poison] after you defeated the Pokemon and if you run into Entei in the wild capture it and migrate it into to Pokemon Diamond/Pearl through Pal Park. If you want to migrate in Diamond/Pearl you'll need to see all 150 Pokemon yes both Dialga and Palkia. You'll see Dialga in Pearl from an elderly woman who's shows you its picture and the same with Palkia in Diamond from the same elderly woman in Celestic Town. This adds its data to your Pokedex and less Pokemon to see in Diamond/Pearl.
Migrating Pokemon only happens after you beat the elite four. If you have a Pokemon Ruby, Sapphire, Emerald, Leaf Green or Fire Red cartridge in your gameboy, when you go to the opening screen in your Pokemon Diamond/Pearl version, there should be another link right above the Nintendo Wi-fi thingy. It should Migrate Pokemon from Ruby/Sapphire/Emerald/Leafgreen/Firered. you can then migrate Pokemon into your Pokemon Diamond and Pearl version. You can send six Pokemon at a time (no more, no less) once every twenty-four hours. To catch them, you have to go to pal park on route 221 (right below sandgem town) to catch them. You have to catch all six to keep them. You can't migrate more than six Pokemon into pal park at a time. Have fun at Pal Park!
fight with them and walk around with them,and if they faint,they will like you less.
You import it by putting Ruby, Sapphire, or Emerald in the GBA slot of your DS, and selecting "Migrate from _______" on your start screen . You can import 6 Pokemon every 24 hours; and you can't import any less than 6 at a time (the Pokemon you want to import have to be in your PC).
Less than 2 hours.
Well, if you are asking how to migrate Pokemon from Sapphire (or another GRA Pokemon title) to Diamond (or Pearl), this is how you do it: First, you have to have been to the Pal Park in Diamond, and have the National Pokedex. Save the game. Turn off the game. Put your Sapphire game cartridge into your DS. Turn on and load your game. On the opening screen there should be a migrate option. It will allow you to choose 6 Pokemon to migrate. (You have to transfer 6 at a time, not more, not less.) After choosing the Pokemon to migrate, go to the Pal Park again in Diamond (I sure hope you can fly there, because walking there STINKS.). Talk to the guy at the desk and he'll ask you if you want to play the game. Say yes, and then you have to go in and catch the 6 Pokemon with the special park balls. Caution: Make sure, if you are migrating something that swims, that you bring a Pokemon that allows you to go out on the water.
In Pokemon diamond pearl or platinum, slather honey on the yellow tree just outside of Canalave City. it doesn't matter how much honey is on it, and you have to come back later that 12 hours but less than 24 hours.
The attack lasted less than 2 hours.
First you need to finish Diamond or Pearl. This means you need to defeat the entire Elite Four, and get into the hall of fame. After doing so, Prof. Oak will let you know that Pal Park has opened. Now I suggest you turn on your GBA game (after saving your game on Diamond or Pearl first) and select SIX Pokemon you wish to migrate ahead of time. YOU CANNOT MIGRATE POKEMON THAT ARE IN YOUR PARTY. You cannot choose less than 6 Pokemon to Migrate (weird O.o) After pre-choosing your Pokemon (Keep your GBA cartridge in your DS), go to the start-up menu of your game then you will see an option called "Migrate from XXXX". XXXX being whatever GBA game you have inserted into your DS. Next select your Six Pokemon and your game will prompt you about migrating them. DO NOT TURN OFF YOUR DS!!! Here is why: Your Pokemon that you have migrated are at Pal Park. This means that if you don't re-catch your Pokemon (100% catch rate by the way) they're gone forever. So plan to catch them right away when you migrate your Pokemon so you don't forget! After you make enough preparations, go into the pal park and start searching for your Pokemon, there are 5 areas of capture: Field Woods Cave/Mountain Shallow Water Sea Remember what Pokemon you migrated, because you're going to find your Pokemon in the areas that match your Pokemon the most. Most Legendaries will pop up in the Cave/Mountain area. You have unlimited time to capture your Pokemon, but the faster you do so, the better your personal score and you get a prize. Just remember to capture them all or they will be gone forever.
When transferring or migrating from Ruby, Sapphire, Fire Red, Leaf Green or Emerald - you must migrate 6 Pokémon - no more, no less.
Pokemon playthroughs to the end of the main game can last between 2 hours and 50 hours, depending on your level of experience.
They migrate because of the weather. If the weather is 50 degrees or less, they are not able to fly. If the weather is 45 degrees or less, they are paralyzed.