I tried to have the Poison, Sun, and Ice Stones have more than one use, though I ended up having the Fire Stone have only one use. I could have used the Fire Stone on Charcadet, but I figured tha the Sun Stone would have made a better contras to the Moon Stone-powered Ceruledge, since Ceruledge is an unscrupulous knight while Armarouge is an honourable knight.
The above is the reason why Yanmega evolves wi the Sun Stone. I could have had #218 evolve wi the Sun Stone, but, since #217 and #218 are snow bunnies, that would imply tha they would melt.
Misdreavus evolving wi the Moon Stone is because I did not wan to add a Dusk Stone and a subsequent Dawn Stone and Shiny Stone.
Raitora never got any evolution data outside of the currently-unknown Pokémon Red and Green beta. I fel that a Thunder Stone fits.
I ended up making Beta Wooper the 'baby' form of Wooper, then having Beta Wooper evolve into different formes depending on the stone. A result is that Beta Wooper is Water/Ground instead of just Water.
Any trad evolutions, now use the Link Cable from Pokémon Mystery Dungeon, which is used the same way a Stone is used. Ditto does not need to hold a Metal Coat.
Other evolutionary items include the Paleo Feed (based on the Paleolithic diet) and Soylent (based on the 'futuristic', soy-based meal replacement). Paleo Feed turns a Pokémon into its Past Paradox version, while Soylent turns a Pokémon into its Future Paradox version. You have to bea the game before you can ge these. However, the 'wrong' food costs a lot more compared to the 'right' food: Soylent is far mor expensive in Pokémon Scarlet but cheaper in Pokémon Violet.
I switched any Let's Go evolutions to friendship evolutions, since the amount of walking you would have to do with a friendship-based evolution should mimick the walking aspect of Let's Go evolutions.
#223 evolving into #224 through friendship i supposed to reflec the 'nurturing' aspect of the Pokémon, which are based on delivery storks. I later alised that #223 is a Baby Pokémon and would hav evolved with igh friendship, anyways.
The same reason is behind Gimmighoul evolving into Gholdengo: you teac him to be a lot mor friendlier.
The same reason is behind Dunsparce volving into Dudunsparce: he got an evolution out of the love the fanbase gave him.
The same reason is behind Greavard evolving into Houndstone instead of a Moon Stone: you are giving Greavard th affection Greavard craves. More importantly, friendship is the only time-based trigger.
Because Palafin really depends on his ability, I decided upon splitting Palafin's formes into separat evolutions. Evolving Finizen into Zero Palafin only requires the level-up, whereas evolving Hero Palafin requires friendship, whic should mimick the social aspect of leveling up him in the Union Circle. Then again, this could reflect how simply having superpowers does not make you a superhero, whereas you teac him to love others. The reason why I had him evolve in the day is because I felt weird having only a night-tim evolution without a day evolution. Palafin got hat evolution since Palafin is an Ekpy of Superman, who ended up being the day-based counterpart of the night-based Batman.
Conversely, evolving Primeape into Annihilape with low frienship i supposed to reflec the resentment Primeape gets upon evolving into Annihilape. That is also horrifying, but at least canon.
I fel that keeping the beta nd final evolution lines of Girafarig separate was appropriate. I made Johtonian Girafarig evolve into Farigiraf with equal Attack and Defense in reference to the symmetry of Girafarig's name and esign.
I would have had Kirlia evolve via gender, bu there is no gender check when evolving, whereas having different-gendered versions of the same Pokémon would waste valuable Pokémon slots. I plan on checking on the gender check later, though.
Bisharp evolves into Kingambit with LV 64 since the Pawniard line has a chess motif, and there are 64 squares on a chessboard. I did not want oo high a level, since that would make Kingambit impractical until th end of the game. (The 'wrong' Paradox formes are more a prize to the player.)
The level evolutions of Gyarth and #217 was just me putting what felt right.