Some Pokemon forms are not normally accessible in the grid, but can be loaded with the Write/Import box.
The key names for those forms are listed below:

Standard forms:
Shock Drive Genesect: GENESECT_1
Burn Drive Genesect: GENESECT_2
Chill Drive Genesect: GENESECT_3
Douse Drive Genesect: GENESECT_4
Full Moon Lunala: LUNALA_1
Radiant Sun Solgaleo: SOLGALEO_1
Zenith Marshadow: MARSHADOW_1
Busted Mimikyu: MIMIKYU_1
Behemoth Blade Zacian: ZACIAN_2
Behemoth Bash Zamazenta: ZAMAZENTA_2
Dada Zarude: ZARUDE_1
Cosplay Pikachu: PIKACHU_2
Belle Pikachu: PIKACHU_3
Libre Pikachu: PIKACHU_4
Ph.D. Pikachu: PIKACHU_5
Pop Star Pikachu: PIKACHU_6
Rock Star Pikachu: PIKACHU_7
Ash Cap Pikachu: PIKACHU_8
Hoenn Cap Pikachu: PIKACHU_9
Sinnoh Cap Pikachu: PIKACHU_10
Unova Cap Pikachu: PIKACHU_11
Kalos Cap Pikachu: PIKACHU_12
Alola Cap Pikachu: PIKACHU_13
Partner Cap Pikachu: PIKACHU_14
World Cap Pikachu: PIKACHU_15



Female forms:
Abomasnow: ABOMASNOW_female
Alakazam: ALAKAZAM_female
Aipom: AIPOM_female
Ambipom: AMBIPOM_female
Beautifly: BEAUTIFLY_female
Bibarel: BIBAREL_female
Bidoof: BIDOOF_female
Blaziken: BLAZIKEN_female
Butterfree: BUTTERFREE_female
Cacturne: CACTURNE_female
Camerupt: CAMERUPT_female
Combee: COMBEE_female
Combusken: COMBUSKEN_female
Croagunk: CROAGUNK_female
Dodrio: DODRIO_female
Doduo: DODUO_female
Donphan: DONPHAN_female
Dustox: DUSTOX_female
Finneon: FINNEON_female
Garchomp: GARCHOMP_female
Gible: GIBLE_female
Girafarig: GIRAFARIG_female
Gligar: GLIGAR_female
Gloom: GLOOM_female
Golbat: GOLBAT_female
Goldeen: GOLDEEN_female
Gulpin: GULPIN_female
Gyarados: GYARADOS_female
Heracross: HERACROSS_female
Houndoom: HOUNDOOM_female
Hypno: HYPNO_female
Kadabra: KADABRA_female
Kricketot: KRICKETOT_female
Kricketune: KRICKETUNE_female
Ledian: LEDIAN_female
Ledyba: LEDYBA_female
Ludicolo: LUDICOLO_female
Lumineon: LUMINEON_female
Luxio: LUXIO_female
Luxray: LUXRAY_female
Magikarp: MAGIKARP_female
Mamoswine: MAMOSWINE_female
Medicham: MEDICHAM_female
Meditite: MEDITITE_female
Meganium: MEGANIUM_female
Milotic: MILOTIC_female
Numel: NUMEL_female
Nuzleaf: NUZLEAF_female
Octillery: OCTILLERY_female
Pikachu: PIKACHU_female
Piloswine: PILOSWINE_female
Politoed: POLITOED_female
Quagsire: QUAGSIRE_female
Raichu: RAICHU_female
Raticate: RATICATE_female
Rattata: RATTATA_female
Relicanth: RELICANTH_female
Rhydon: RHYDON_female
Rhyhorn: RHYHORN_female
Rhyperior: RHYPERIOR_female
Roselia: ROSELIA_female
Roserade: ROSERADE_female
Scizor: SCIZOR_female
Scyther: SCYTHER_female
Seaking: SEAKING_female
Shiftry: SHIFTRY_female
Shinx: SHINX_female
Sneasel: SNEASEL_female
Sneasel (Hisuian): SNEASEL_1_female
Snover: SNOVER_female
Staraptor: STARAPTOR_female
Staravia: STARAVIA_female
Starly: STARLY_female
Steelix: STEELIX_female
Sudowoodo: SUDOWOODO_female
Swalot: SWALOT_female
Tangrowth: TANGROWTH_female
Toxicroak: TOXICROAK_female
Ursaring: URSARING_female
Venusaur: VENUSAUR_female
Vileplume: VILEPLUME_female
Weavile: WEAVILE_female
Wobbuffet: WOBBUFFET_female
Wooper: WOOPER_female



Additional forms:
Antique Polteageist: POLTEAGEIST_1
Antique Sinistea: SINISTEA_1
Fire Arceus: ARCEUS_1
Water Arceus: ARCEUS_2
Grass Arceus: ARCEUS_3
Electric Arceus: ARCEUS_4
Ice Arceus: ARCEUS_5
Fighting Arceus: ARCEUS_6
Poison Arceus: ARCEUS_7
Ground Arceus: ARCEUS_8
Flying Arceus: ARCEUS_9
Psychic Arceus: ARCEUS_10
Bug Arceus: ARCEUS_11
Rock Arceus: ARCEUS_12
Ghost Arceus: ARCEUS_13
Dragon Arceus: ARCEUS_14
Dark Arceus: ARCEUS_15
Steel Arceus: ARCEUS_16
Fairy Arceus: ARCEUS_17
Fire Silvally: SILVALLY_1
Water Silvally: SILVALLY_2
Grass Silvally: SILVALLY_3
Electric Silvally: SILVALLY_4
Ice Silvally: SILVALLY_5
Fighting Silvally: SILVALLY_6
Poison Silvally: SILVALLY_7
Ground Silvally: SILVALLY_8
Flying Silvally: SILVALLY_9
Psychic Silvally: SILVALLY_10
Bug Silvally: SILVALLY_11
Rock Silvally: SILVALLY_12
Ghost Silvally: SILVALLY_13
Dragon Silvally: SILVALLY_14
Dark Silvally: SILVALLY_15
Steel Silvally: SILVALLY_16
Fairy Silvally: SILVALLY_17
