New Garganacl and Naclstack battle sprite + various battle sprite fixes

[kittenchilly]

Description

Replaces the Garganacl and Naclstack sprite with the one from CyanSixFour's repo.

Additionally fixes the following battle sprite issues from #5135

• Garganacl could use a better sprite
• Spidops battle shiny eyes
• Wattrel battle shiny eyes
• Kilowattrel battle shiny legs
• Shroodle battle shiny palette wrong
• Bombirdier battle stray green pixels on wings, shiny toes
• Orthworm battle stray black pixels in mouth
• Veluza battle stray pixels in mouth
• Aerodactyl-Mega battle shiny or normal either doesn't or have a flap at the back of the mouth that should/shouldn't be there.
• Medicham-Mega battle shiny leg shawl thingy loses texture and arm bangles change
• Absol-Mega battle heel spikes not visible
• Salamence-Mega battle eyes could be more triangular
• Lati(a/o)s-Mega battle open mouth looks like a derp tongue
• Diancie-Mega battle shiny outline of waist gold thingy
• Ponyta-Galar battle shiny hair too yellow
• Rapidash-Galar battle shiny hair too yellow
• Magearna battle shiny missing.
• Landorus battle-front shiny tail wrong shade.

Discord contact info

kittenchilly

[hedara90]

Some comments, let me know if you think it should be changed or not

[hedara90]

[hedara90]

Checks 18 sprites in #5135