The Pokemon #155 Cyndaquil does not naturally appear in the Diamond and Pearl versions you will need to transfer it via the Pal Park once you have the NationalDex after defeating the Elite Four
Use this site for finding Pokemon locations and othe various info
http://www.serebii.net/pokedex-dp/155.shtml
the only way to actually get him or the other johto starters (gold and silver games, cyndaquil, totodile, chikorita) is to complete the hoenn dex(see all 200/202 Pokemon in the ruby, sapphire and emerald games) in emerald, then prof. oak will call you on poke'nav and tell you he has a surprise for you, you go to him and you can choose cyndaquil, totodile or chikorita.
You would need to use an Action Replay or transfer it from Pokemon Emerald, FireRed, or LeafGreen, for it is impossible to catch Deoxys in any location in Pokemon Diamond, Pearl, and Platinum.
Yes if you want it on pearl
In Pokemon Diamond/Pearl, you find a old man at route 212 with a Leafeon.
Of course you can. I played my Pokemon Diamond with my cousin that has Pearl.
Of course! Try going to www.serebii.net, click on the Diamond/Pearl under the Games on the left side, and find Swarming on the right side of the nest screen. there are 29 different kinds of swarming Pokemon in Pokemon pearl and Pokemon diamond
you have to trade cyndaquil to pearl to get it
You can use a Cyndaquil as a starter Pokemon in heart gold, soul silver, gold, silver, crystal and diamond pearl platinum.
Cyndaquil and all other pre-fourth generation starters are unavailable in Pokemon pearl and diamond. You must transfer it from Pokemon Emerald. If you do not have Emerald, sign up on a Pokemon trading forum and find someone who is willing to trade you one.
You can't catch it in Pokemon Diamond or Pearl. You have to transfer it via Pal Park from Pokemon Emerald, Leaf Green, or Fire Red. Before you do this, however, you need to have a national Pokedex in both games, and have a Cyndaquil in the GBA game. This is somebody else. I know theres an action replay code to get cyndaquil in diamond becuz i have chikorita ad totodile.
In Hearthrome.
The site listed below has a chart for the Pokemon Finneon Diamond and Pearl edition.
Very north of sunyshore city.
Sunyshore City
sunnyshore city
You cannot catch totodile, chikorita, or cyndaquil in Pokemon diamond or Pokemon pearl. The only way to obtain those Pokemon is to migrate them from a previous version of the game using the GBA slot.
No, you cannot catch Cyndaquil in Pokémon Pearl.
To the right of Mt. coronet