Pikachu/Eevee Mode

So some bits of this are untested, but the base starters are unaffected. I had to work a lot with the sprite limits so Oak's lab has been changed a bit.

This adds a Pikachu and Eevee "mode" to the game, allowing you to pick them as starters. When doing so, the Rival will always pick the opposite.

There are some glitches;
- Picking Charmander makes Blue erase himself from existence
- Picking from anywhere other than the front of the table may have odd results.
- Oak has to be shown in the lab at the start from now on for some reason; side effect of removing the dexes, there's definitely a fix for this.
These are from me not finishing the ball picking process - it was a little weird.

Parties based on starters have been updated but I had to cut out a lot of unused trainer slots.

Also the unused names were removed.

engine/debug/debug_party.asm

@@ -22,14 +22,6 @@ SetIshiharaTeam:
 
 IshiharaTeam:
 	db SCREAM_TAIL, 90
-IF DEF(_DEBUG)
-	db MAGNEZONE, 50
-ELSE
-	db MAGNEZONE, 20
-ENDC
-	db MAGMORTAR, 56
-	db ELECTIVIRE, 56
-	db ANNIHILAPE, 57
 IF DEF(_DEBUG)
 	db KADABRA, 16
 ENDC

engine/events/starter_dex.asm

@@ -1,7 +1,7 @@
-; this function temporarily makes the starters (and Ivysaur) seen
+; this function temporarily makes the starters (and once Ivysaur) seen
 ; so that the full Pokedex information gets displayed in Oak's lab
 StarterDex:
-	ld a, 1 << (DEX_BULBASAUR - 1) | 1 << (DEX_IVYSAUR - 1) | 1 << (DEX_CHARMANDER - 1) | 1 << (DEX_SQUIRTLE - 1)
+	ld a, 1 << (DEX_BULBASAUR - 1) | 1 << (DEX_CHARMANDER - 1) | 1 << (DEX_SQUIRTLE - 1) | 1 << (DEX_PIKACHU - 1) | 1 << (DEX_EEVEE - 1)
 	ld [wPokedexOwned], a
 	predef ShowPokedexData
 	xor a