Instructions:
Apply the xdelta file to an unheadered, clean Black 2 ROM using the patcher of your choice.

LOCATION CHANGES:

-Butterfree-
Route 12 shaking grass 10%

-Mr. Mime-
Route 20 shaking grass 10%

-Pinsir-
Route 12 5%
Lostlorn Forest 5%

-Minun-
Route 6 shaking grass 5%

-Ledian-
Route 22 shaking grass 10%

-Elekid-
Virbank Industrail Complex shaking grass 10%

-Skitty-
Castelia City Park 10%

-Illumise-
Route 3 shaking grass 5%

-Numel-
Reversal Mountain 5%

-Glameow-
Floccesy Ranch shaking grass 5%

-Stunky-
Floccesy Ranch shaking grass 5%

-Latias-
Dreamyard shaking grass 5%

-Victini-
Castelia City Park 1%

-Servine-
Route 12 shaking grass 5%

-Pignite-
Underground Ruins dust cloud 5%

-Dewott-
Undella Bay surfing spot 4%

-Petilil- 
Castelia City Park 10%
Pinwheel Forest 4%
Abundant Shrine 4%
Lostlorn Forest 4%
Victory Road 10%

-Lilligant-
Pinweehl Forest shaking grass 1%
Castelia City Park shaking grass 1%
Abundant Shrine shaking grass 1%
Lostlorn Forest shaking grass 1%
Victory Road shaking grass 1%

-Solosis-
Route 5 10%
Route 16 14%
Strange House 1F (depends on floor)

-Duosion-
Route 9 4%
Strange House (depends on floor)

-Reuniclus-
Route 9 1%

-Rufflet-
Route 23 4%

-Tirtouga-
Dragonspiral Tower surfing spot 10%

-Archen-
Route 11 shaking grass 10%

-Landorus-
Desert Resort 1%

-Tornadus-
Moor of Icirrus 1%

-Thunderus-
Chargestone Cave 1%

-Reshiram-
Giant Chasm dust cloud 5%

-Meloetta-
Village Bridge shaking grass 5%

-Keldeo-
Route 14 shaking grass 5%

-Genesect- 
P2 Laboratory shaking grass 5%

EVOLUTION CHANGES:

Kadabra-Alakazam level 42
Graveler-Golem level 42
Machoke-Machamp level 42
Haunter-Gengar level 42

Scyther-Scizor level up holding Metal Coat during the day
Onix-Steelix level up holding Metal Coat during the night
Poliwhirl-Politoed level up holding King's Rock during the night
Slowpoke-Slowking use level up holding King's Rock during the day
Seadra-Kingdra level up holding Dragon Scale during the day
Porygon-Porygon2 level up holding Up-Grade during the day

Porygon2-Porygon-Z level up holding Dubious Disk during the night
Feebas-Milotic level up holding Prism Scale during the day
Dusklops-Dusknoir level up holding Reaper Cloth during the night
Rhydon-Rhyperior level up holding Protector during the day
Electabuzz-Electivire level up holding Electirizer during the day
Magmar-Magmortar level up holding Magmarizer during the night
Clamperl-Huntail level up holding DeepSeaTooth during the night
Clamperl-Gorebyss level up holding DeepSeaScale during the day

Boldore-Gigalith level 42
Gurdurr-Conkeldurr level 42

Karrablast-Escavelier level up with Shelmet in party
Shelmet-Accelgor level up with Karrablast in party

ITEM CHANGES:
Swanna can hold a Plume Fossil
Relicanth can hold a Cover Fossil