Pansage is found at the Pinwheel Forest and the Lostlorn Forest; evolves via Leaf Stone.
Pansear is found at the Pinwheel Forest and the Lostlorn Forest; evolves via Fire Stone.
Panpour is found at the Pinwheel Forest and the Lostlorn Forest; evolves via Water Stone
Growlithe can be found at the Virbank Complex; evolves via Fire Stone.
Magmortar can be found at the Virbank Complex as a Magby in B2. Evolve the Magby into a Magmar at level 30, then trade it holding the Magmarizer.
Electivire can be found as an Elekid in the Virbank Complex in W2. Evolve the Elekid into an Electabuzz at level 30, then trade it holding the Electrizer.
Catch a Boldore in the Chargestone Cave, Wellspring Cave, Mistralton Cave, Twist Mountain, Victory Road, Clay Tunnel, Reversal Mountain, Relic Passage, Seaside Cave, or Underground Ruins, and trade it.
You don't need to trade an Onix holding a Metal Coat to evolve it, because Steelix can be found at the Twist Mountain, Clay Tunnel, and Underground Ruins via Dust Cloud.
Cottonee evolves via Sun Stone and can be found at these places: Abundant Shrine, Castelia City, Lostlorn Forest, Victory Road, or Pinwheel Forest in B2 only. Or you can find a Whimsicott at these places via Rustling Grass.
Petilil and Lilligant are mirrored from above, except they're found in W2 only.
Catch a Munna in the Dreamyard and use a Moon Stone on it.
Catch a Clefairy in the Giant Chasm and use a Moon Stone on it.
Catch an Eevee in Castelia City and use a Water/Fire/Thunderstone on it.
Catch a Mincinno at Route 4, 5, 9, 16 and use a Shiny Stone on it.
Catch a Roselia at the Lostlorn Forest, Route 12, or Victory Road and use a Shiny Stone on it.
Catch a Karrablast and a Shelmet on Route 6, 8, 11, Icirrus City, or Moor of Icirrus(no Pokemon in the winter), and trade between them to evolve them.
Catch an Eelektrik in the Seaside Cave(B1) and use a Thunderstone on it.
Catch a Gligar at Route 11, 15, or 23 and level it up holding the Razor Fang between 8pm and 4am to evolve it.
Catch a Staryu at Undella Town, Humilau City, or Route 13 and use a a Water Stone on it.
Catch a Sneasel at the Giant Chasm level it up between 8pm and 4am holding the Razor Claw to evolve it.
And last but not least catch a Jigglypuff on Routes 1 and 2 or the Dreamyard, and use a Moon Stone to evolve it.
Hope I helped!
Source: Experience and Knowledge
