These are my theories on the words that are combined to make the new Black/White Pokemon's names.  Some are obvious, and a few I am proud of myself for thinking of.  I may be wrong on some.  If you have any suggestions, I will gladly take them.

#494 - Victini: victory+tiny
#495 - Snivy: snake+ivy
#496 - Servine: serpent+vine
#497 - Serperior: serpent+superior
#498 - Tepig: tepid+pig
#499 - Pignite: pig+ignite
#500 - Emboar: ember+boar
#501 - Oshawott: ocean+water+otter
#502 - Dewott: dew+water+otter
#503 - Samurott: samurai+otter
#504 - Patrat: patriot?/pat?+rat
#505 - Watchog: watch+hog
#506 - Lillipup: little(lil)+pup(py)
#507 - Herdier: herd+terrier
#508 - Stoutland: stout+Scotland?
#509 - Purrloin: purr+purloin
#510 - Liepard: lie+leopard
#511 - Pansage: chimpanzee+sage
#512 - Simisage: simian+sage
#513 - Pansear: chimpanzee+sear
#514 – Simisear: simian+sear
#515 – Panpour: chimpanzee+pour
#516 – Simipour: simian+pour
#517 – Munna:        japanese
#518 – Musharna: japanese
#519 – Pidove: pigeon+dove
#520 – Tranquill: tranquil+quill
#521 - Unfezant: pheasant+unpleasant?
#522 – Blitzle: blitz+little?
#523 – Zebstrika: zebra+strike+stripe?
#524 - Roggenrola: “rock ‘n roll”
#525 – Boldore: boulder+ore
#526 – Gigalith: giga+-lith(stone)
#527 - Woobat: woo+bat
#528 – Swoobat: swoon+bat
#529 – Drilbur: drill+?
#530 – Excadrill: excavate+drill
#531 – Audino: ?
#532 – Timburr: timber+"urr"
#533 – Gurdurr: girder+"urr"
#534 – Conkeldurr: concrete+elder?+"urr"
#535 – Tympole: ?+tadpole
#536 – Palpitoad: palpitate+toad
#537 – Seismitoad: seismic+toad
#538 - Throh: throw+"oh"
#539 - Sawk : sock?
#540 – Sewaddle: seed?+sew?+swaddle
#541 – Swadloon: swaddle+shalloon?/galloon?
#542 – Leavanny: leaves+nanny
#543 – Venipede: venom+centipede
#544 – Whirlipede: whirl(whirligig)+centipede
#545 – Scolipede: scolopendra+centipede
#546 – Cottonee: cotton+seed?
#547 – Whimsicott: whimsical+cotton
#548 – Petilil: petal+lily
#549 – Lilligant: lily+elegant
#550 – Basculin: bass+masculine
#551 – Sandile: sand+crocodile
#552 – Krokorok: crocodile+rock
#553 - Krookodile: crook+crocodile
#554 – Darumaka:   daruma+? (japanese)
#555 – Darmanitan: daruma+orangutan
#556 – Maractus: maraca+cactus
#557 – Dwebble: dwell+pebble
#558 – Crustle: crust+castle
#559 – Scraggy: skin+craggy
#560 – Scrafty: skin+crafty
#561 – Sigilyph: sigil+glyph?
#562 – Yamask: ?+mask
#563 - Cofagrigus: coffin+sarcophagus  
#564 – Tirtouga: turtle+tortuga
#565 – Carracosta: carrack+costa?/coast?
#566 – Archen: archaeopteryx+?
#567 – Archeops: archaeopteryx
#568 – Trubbish: trash(trouble?)+rubbish
#569 – Garbodor: garbage+odor
#570 – Zorua:   zoro
#571 – Zoroark: zoro+dark
#572 – Minccino: mini+chinchilla+?
#573 – Cinccino: chinchilla+?
#574 – Gothita: gothic+-ita
#575 – Gothorita: gothic+(sen)orita
#576 – Gothitelle: gothic+mademoiselle?
#577 – Solosis: solo+meiosis?
#578 – Duosion: duo+division?
#579 – Reuniclus: reunite+homunculus
#580 – Ducklett: duck+eaglet?
#581 – Swanna: swan+donna?
#582 – Vanillite: vanilla+-ite/lite?/delite?
#583 – Vanillish: vanilla+-ish/delicious?
#584 – Vanilluxe: vanilla+deluxe
#585 - Deerling: deer+seedling
#586 - Sawsbuck: season?/sawbuck?+buck
#587 – Emolga: emonate+? (japanese)
#588 – Karrablast: scarab+blast
#589 – Escavalier: scarab(escargo?/escape?)+cavalier
#590 – Foongus: fool+fungus
#591 – Amoonguss: fungus+fool+among us (there's a foongus amoong-us)
#592 – Frillish: frill+fish
#593 – Jellicent: jellyfish+magnificent
#594 – Alomomola: mola(sunfish) - palindrome
#595 – Joltik: jolt+tick
#596 – Galvantula: galvanization+tarantula
#597 – Ferroseed: ferrous(iron)/ferocious?+seed
#598 – Ferrothorn: ferrous(iron)/ferocious?+thorn
#599 – Klink:         “clink”
#600 – Klang: “clang”
#601 – Klinklang: “clink”+“clang”
#602 – Tynamo: tiny+dynamo?
#603 – Eelektrik: eel+electric
#604 – Eelektross: eel+electric+cross?
#605 – Elgyem: ?
#606 – Beheeyem: behemoth+?
#607 – Litwick: lit+wick
#608 – Lampent: lamp+lament
#609 – Chandelure: chandelier+lure
#610 – Axew : axe+chew
#611 – Fraxure: fracture+axe
#612 – Haxorus: hack+axe+-saurus
#613 - Cubchoo: cub+”achoo”
#614 - Beartic:      bear+arctic
#615 – Cryogonal: cryogenesis+hexagonal
#616 – Shelmet: shell+helmet
#617 – Accelgor: accelerate+vigor
#618 – Stunfisk: stun+fish+disk?
#619 – Mienfoo: mien+kung fu?
#620 – Mienshao: mien+shaolin
#621 – Druddigon: dragon+?
#622 – Golett: golem+yett
#623 – Golurk: golem+lurk
#624 – Pawniard: pawn+poniard
#625 – Bisharp: bishop+sharp
#626 – Bouffalant: bouffant+buffalo
#627 – Rufflet:         ruffle/rough+eaglet
#628 – Braviary: brave+aviary
#629 – Vullaby: vulture+lullaby/baby
#630 – Mandibuzz: mandible+buzzard
#631 – Heatmor: heat+?
#632 – Durant: durable+ant
#633 – Deino: dinosaur+reign?
#634 – Zweilous: ?
#635 – Hydreigon: hydrogen?+dragon
#636 – Larvesta: larva+infest/harvest?
#637 – Volcarona: volcano+corona
#638 – Cobalion: cobalt+ion
#639 - Terrakion:    terra+ion
#640 - Virizion:        virus?/ion
#641 - Tornadus:     tornado+-us
#642 - Thundurus:  thunder+-us
#643 - Reshiram:      japanese
#644 - Zekrom:         japanese
#645 - Landorus:     land+-us
#646 - Kyurem:        japanese
#647 - Keldeo?:        kelp?+?
#648 - Meloetta?:      melody+-etta
#649 - Genesect?:     gene+insect