B/W may be the latest Pokemon game, but unlike any of the previous games, it doesn't turn to making another billion new methods to evolve your Pokemon or another billion new evolution stones. There are still new methods, but those have mercifully been kept to a minimum, instead focusing on the use of existing evolution methods to evolve the new Pokemon. Old Pokemon which have lost their evolution method due to the new location and removal of certain features (heh, knew it'd come back to haunt Game Freak someday) also have replacement methods.
Old stones finally get a new lease of life. It's almost refreshing.
Fire Stone
Baoppu evolves into Baokki 
to 
Water Stone
Hiyappu evolves into Hiyakki
to 
Leaf Stone
Yanappu evolves into Yanakki
to 
Thunder Stone
Shibiriru evolves into Shibirudon
to 
Moon Stone
Munna evolves into Musharna
to 
Sun Stone
Monmen evolves into Erufuun
to 
Churine evolves into Doredia
to 
Dusk Stone
Ranpuraa evolves into Chanderaa
to 
Dawn Stone
Chiramii evolves into Chirachiino
to 
-----
Trade
Gantoru evolves into Gigiasu (in the same vein as Graveler to Golem)
to 
Dotekkotsu evolves into Roobushin (like Machoke to Machamp)
to 
Happiness
Koromori evolves into Kokoromori
to 
Kurumayu evolves into Hahakomori
to 
Old Pokemon who have lost evolution methods like Feebas, Eevee and Magneton have either got new trade items, or substitute places for them to level up and evolve. As for new methods, there are only two- one is a new trade item, and the other is a Pokemon species-specific trade. I won't elaborate on them, maybe not just yet~!
