Add B/W 2 encounters

- Victory Road, Giant Chasm, and Reversal Mountain have unknown area
  names. The others are hopefully accurate.

- Swarms are, again, not present. Neither are Hidden Grove encounters.

pokedex/data/csv/encounter_slots.csv

@@ -329,3 +329,83 @@ id,version_group_id,encounter_method_id,slot,rarity
 328,11,11,10,4
 329,11,11,11,1
 330,11,11,12,1
+331,14,4,1,40
+332,14,4,2,40
+333,14,4,3,15
+334,14,4,4,4
+335,14,4,5,1
+336,14,12,1,40
+337,14,12,2,40
+338,14,12,3,15
+339,14,12,4,4
+340,14,12,5,1
+341,14,5,1,60
+342,14,5,2,30
+343,14,5,3,5
+344,14,5,4,4
+345,14,5,5,1
+346,14,13,1,60
+347,14,13,2,30
+348,14,13,3,5
+349,14,13,4,4
+350,14,13,5,1
+351,14,8,1,20
+352,14,8,2,20
+353,14,8,3,10
+354,14,8,4,10
+355,14,8,5,10
+356,14,8,6,10
+357,14,8,7,5
+358,14,8,8,5
+359,14,8,9,4
+360,14,8,10,4
+361,14,8,11,1
+362,14,8,12,1
+363,14,9,1,20
+364,14,9,2,20
+365,14,9,3,10
+366,14,9,4,10
+367,14,9,5,10
+368,14,9,6,10
+369,14,9,7,5
+370,14,9,8,5
+371,14,9,9,4
+372,14,9,10,4
+373,14,9,11,1
+374,14,9,12,1
+375,14,1,1,20
+376,14,1,2,20
+377,14,1,3,10
+378,14,1,4,10
+379,14,1,5,10
+380,14,1,6,10
+381,14,1,7,5
+382,14,1,8,5
+383,14,1,9,4
+384,14,1,10,4
+385,14,1,11,1
+386,14,1,12,1
+387,14,10,1,20
+388,14,10,2,20
+389,14,10,3,10
+390,14,10,4,10
+391,14,10,5,10
+392,14,10,6,10
+393,14,10,7,5
+394,14,10,8,5
+395,14,10,9,4
+396,14,10,10,4
+397,14,10,11,1
+398,14,10,12,1
+399,14,11,1,20
+400,14,11,2,20
+401,14,11,3,10
+402,14,11,4,10
+403,14,11,5,10
+404,14,11,6,10
+405,14,11,7,5
+406,14,11,8,5
+407,14,11,9,4
+408,14,11,10,4
+409,14,11,11,1
+410,14,11,12,1