Just battle with a friend that has Red, Blue, Yellow, FireRed or LeafGreen. or if you have the game, migrate from it.
You cannot see it in the wild in Pokemon Diamond; you have to transfer it from FireRed/LeafGreen.
Route 225 is not a route that can be found in Pokemon Firered, route 225 is in Pokemon Diamond, Pearl, and Platinum. To get there is Diamond Pearl and Platinum, you have to see every Pokemon in Sinnoh, then talk to Prof. Rowan and get the national dex.
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.
Your rival will get a venusaur only if you chose squirtle as your starter i believe he will get one when he is at silph co, other than that to see or get a venusaur a friend with firered or leafgreen needs to give you one.
There is no time in FireRed.
Munchlax is a 4th generation Pokemon meaning it only exist in diamond and pearl and platinum and heartgold and soulsilver so that means munchlax is not a Pokemon you can get in firered. Though in Pokemon xd gale of darkness you can witness munchlax even though you can't get it you can see it and also you can see and use bonsly in the game.
in Pokemon pearl or diamond, you cannot find a legit deoxys. you can only get one in Pokemon emerald, firered, leaf green by visiting birth island.
Well ,you can choose it as your starter Pokemon or ,your Rival will have it if you chose Turtwig. If you chose Piplup as your starter, a Trainer on Route 210 will have it.
trade from firered/leafgreen if starter was squirtle or trade from colleseum snagged from cipher-admin-ein in cipher lab
Sorry No you can see some of the johto league Pokemon on Pokemon diamond and pearl if you go to the battle tower. ive seen a totodile and a cynaquil already. ;)
i will tell me your fc and name my name is jess and my fc is 1917 8028 8719 i will see u there
Don't forget, your friend and Dawn pick a starter also. They're starters evolve also. you eventually get to see all of the forms of the starter.