If your talking about Pokemon Number 47 in the Sinnoh pokedex (Mothim), you can get him from evolving a MALE Burmy at level 20 (You can get Burmy from the Honey Trees by placing Honey on them and then waiting a couple of hours) (You can buy honey from a man at the flower place near Floroama Town).
Parasect it evoles from Paras it looks like a crab
Number 47 is a Mothim
In Pokemon Diamond and Pearl only, it is on the top floor of the Lost Tower.
burmy
9
Regigigas
Pokemon no.147 in the Pokemon Pearl National Pokedex is Dratini.
The Pokemon 47th in the pokedex on Pearl, is Mothim
its monthim
If you are talking about the Sinnoh Dex, then you will find 47 (Mothim) after you evolve a male Burmy, which you find rarely in Honey Trees with Honey.
he is level 47
47
his level 47
Number 25 on the pokedex in Pokemon pearl is BUDEW the grass & poison type Pokemon.
chingling
Riolu
Crobat G
Pokemon #465 is Tangrowth
Dialga is level 47 in Pokemon Diamond and Pearl. Level 70 in Pokemon Platinum. Level 1 in Pokemon HeartGold and SoulSilver.