Implicating spring_deerling → deerling
Link to implication

Reason:

Spring Deerling is a form of Deerling.

I have also searched for additional form implications that are currently not set.

Additional implications for alternate forms:

summer_deerling → deerling
autumn_deerling → deerling
winter_deerling → deerling

spring_sawsbuck → sawsbuck
summer_sawsbuck → sawsbuck
autumn_sawsbuck → sawsbuck
winter_sawsbuck → sawsbuck

red-striped_basculin → basculin
blue-striped_basculin → basculin

cherrim_(overcast_form) → cherrim
cherrim_(sunshine_form) → cherrim

tornadus_(incarnate_form) → tornadus
tornadus_(therian_form) → tornadus

thundurus_(incarnate_form) → thundurus
thundurus_(therian_form) → thundurus

landorus_(incarnate_form) → landorus
landorus_(therian_form) → landorus

xerneas_(active_mode) → xerneas
xerneas_(neutral_mode) → xerneas

rainy_castform → castform
snowy_castform → castform
sunny_castform → castform

minior_(meteor_form) → minior
minior_blue_core → minior
minior_green_core → minior
minior_indigo_core → minior
minior_orange_core → minior
minior_red_core → minior
minior_violet_core → minior
minior_yellow_core → minior

archipelago_vivillon → vivillon
continental_vivillon → vivillon
elegant_vivillon → vivillon
fancy_vivillon → vivillon
garden_vivillon → vivillon
high_plains_vivillon → vivillon
icy_snow_vivillon → vivillon
jungle_vivillon → vivillon
marine_vivillon → vivillon
meadow_vivillon → vivillon
modern_vivillon → vivillon
monsoon_vivillon → vivillon
ocean_vivillon → vivillon
poké_ball_vivillon → vivillon
polar_vivillon → vivillon
river_vivillon → vivillon
sandstorm_vivillon → vivillon
savanna_vivillon → vivillon
sun_vivillon → vivillon
tundra_vivillon → vivillon

unown_a → unown
unown_b → unown
unown_c → unown
unown_d → unown
unown_e → unown
unown_f → unown
unown_g → unown
unown_h → unown
unown_i → unown
unown_j → unown
unown_k → unown
unown_l → unown
unown_m → unown
unown_n → unown
unown_o → unown
unown_p → unown
unown_q → unown
unown_r → unown
unown_s → unown
unown_t → unown
unown_u → unown
unown_v → unown
unown_w → unown
unown_x → unown
unown_y → unown
unown_z → unown
unown_! → unown
unown_? → unown

ash_greninja → greninja (ash_greninja is a character tag and normally, we don't imply a species from character names, but I think this one can be an exception? {Because it's a given that Ash Greninja is going to be a Greninja and not, say, a Lucario})