Pokemon XD: Available Pokemon
Here is a list of available/Snag-able Pokemon in XD along with their levels, location and trainers.

# Pokemon

Level

Trainer / Location

#133 Eevee

10

Starter

#216 Teddirusa

11

Spy Nap / Krane's Lab

#165 Ledyba

10

Casual Guy Cyle / Gateon Port

#261 Poochyena 10 Bodybuilder Kilen / Gateon Port
#228 Houndour 17 Cipher Peon Resix / Cipher Lab
#343 Baltoy 17 Cipher Peon Browsix / Cipher Lab
#363 Spheal 17 Cipher Peon Blusix / Cipher Lab
#179 Mareep 17 Cipher Peon Yellosix / Cipher Lab
#316 Gulpin 17 Cipher Peon Purpsix / Cipher Lab
#273 Seedot 17 Cipher Peon Greesix / Cipher Lab
#167 Spinarak 14 Cipher Peon Nexir / Cipher Lab
#322 Numel 14 Cipher Peon  Solox / Cipher Lab
#285 Shroomish 15 Cipher R&D Klots / Cipher Lab
#318 Carvanha 15 Cipher Peon Cabol / Cipher Lab
#301 Delcatty 18 Cipher Admin Lovrina / Cipher Lab
#100 Voltorb 19 Wanderer Miror.B / Cave PokeSpot
#296 Makuhita 18 Cipher Peon Torkin / ONBS Station
#037 Vulpix 18 Cipher Peon Mesin / ONBS Station
#355 Duskull 19 Cipher Peon Labor / ONBS Station
#280 Ralts 20 Cipher Peon Feldas / ONBS Station Top
#303 Mawile 22 Cipher Commander Exol / ONBS Station Top
#361 Snorunt 20 Cipher Peon Exin / Mayor's House (Phenac)
#204 Pineco 20 Cipher Peon Gonrag / Mayor's House (Phenac)
#177 Natu 22 Cipher Peon Eloin / Training School (Phenac)
#315 Roselia 22 Cipher Peon  Fasin / Training School (Phenac)
#052 Meowth 22 Cipher Peon Fostin / Training School (Phenac)
#220 Swinub 22 Cipher Peon Greck / Phenac Stadium
#021 Spearow 22 Cipher Peon Ezin / Phenac Stadium
#088 Grimer 23 Cipher Peon Faltly / Phenac Stadium
#086 Seel 23 Cipher Peon Egrog / Phenac Stadium
#337 Lunatone 25 Cipher Admin Snattle / Phenac Stadium
#299 Nosepass 26 Wanderer Miror.B / Phenac Stadium
#335 Zangoose 28 Thug Zook / Cipher Key Lair
#175 Togepi 25 Hordel / Outskirt Stand
#239 Elekid Same as Togepi Trade Togepi back to Hordel / Outskirt Stand
#046 Paras 28 Cipher Peon Humah / Cipher Key Lair
#058 Growlithe 28 Cipher Peon Humah / Cipher Key Lair
#090 Shellder 29 Cipher Peon Gorog / Cipher Key Lair
#015 Beedrill 30 Cipher Peon Lok / Cipher Key Lair
#017 Pidgeotto 30 Cipher Peon Lok / Cipher Key Lair
#144 Tangela 30 Cipher Peon Targ / Cipher Key Lair
#012 Butterfree 30 Cipher Peon Targ / Cipher Key Lair
#082 Magneton 30 Cipher Peon Snidle / Cipher Key Lair
#049 Venomoth 32 Cipher Peon Angic / Cipher Key Lair
#070 Weepinbell 32 Cipher Peon Angic / Cipher Key Lair
#024 Arbok 33 Cipher Peon Smarton / Cipher Key Lair
#057 Primeape 34 Cipher Admin Gorigan / Cipher Key Lair
#097 Hypno 34 Cipher Admin Gorigan / Cipher Key Lair
#055 Golduck 33 Navigator Abson / Citadark Isle
#302 Sableye 33 Navigator Abson / Citadark Isle
#020 Raitcate 34 Chaser Furgy / Citadark Isle
#085 Dodrio 34 Chaser Furgy / Citadark Isle
#083 Farfetch'd 36 Cipher Admin Lovrina / Citadark Isle
#334 Altaria 36 Cipher Admin Lovrina / Citadark Isle
#115 Kangaskhan 36 Cipher Peon Litnar / Citadark Isle
#354 Banette 37 Cipher Peon Litnar / Citadark Isle
#126 Magmar 36 Cipher Peon Grupel / Citadark Isle
#127 Pinsir 35 Cipher Peon Grupel / Citadark Isle
#219 Magcargo 38 Cipher Peon Kolest / Citadark Isle
#078 Rapidash 40 Cipher Peon Kolest / Citadark Isle
#106 Hitmonlee 38 Cipher Peon Petro / Citadark Isle
#107 Hitmonchan 38 Cipher Peon Karbon / Citadark Isle
#108 Lickitung 38 Cipher Peon Gefta / Citadark Isle
#123 Scyther 40 Cipher Peon Leden / Citadark Isle
#113 Chansey 39 Cipher Peon Leden / Citadark Isle
#338 Solrock 41 Cipher Admin Snattle / Citadark Isle
#121 Starmie 41 Cipher Admin Snattle / Citadark Isle
#125 Eelctabuzz 43 Cipher Admin Ardos / Citadark Isle
#277 Swellow 43 Cipher Admin Ardos / Citadark Isle
#143 Snorlax 43 Cipher Admin Ardos / Citadark Isle
#062 Poliwrath 43 Cipher Admin Gorgian / Citadark Isle
#122 Mr. Mime 43 Cipher Admin Gorgian / Citadark Isle
#051 Dugtrio 40 Cipher Peon Stron / Citadark Isle
#310 Manectric 44 Cipher Admin Eldes / Citadark Isle
#373 Salamence 50 Cipher Admin Eldes / Citadark Isle
#105 Marowak 44 Cipher Admin Eldes / Citadark Isle
#131 Lapras 44 Cipher Admin Eldes / Citadark Isle
#249 Lugia 50 Cipher Boss Greevil / Citadark Isle
#144 Articuno 50 Cipher Boss Greevil / Citadark Isle
#145 Zapdos 50 Cipher Boss Greevil / Citadark Isle
#146 Moltres 50 Cipher Boss Greevil / Citadark Isle
#128 Tauros 46 Cipher Boss Greevil / Citadark Isle
#112 Rhydon 46 Cipher Boss Greevil / Citadark Isle
#103 Exeggutor 46 Cipher Boss Greevil / Citadark Isle
#129 Dragonite 55 Wanderer Miror. B / Gateon Port