>>39675622A few ways
Thunder stone and fire stone exist so you could just do that with Mag and Elect
>NPC Tradean npc will actually acknowledge that some Pokemon will only evolve trading and will trade and trade back Pokemon that need to evolve like that for you,
(can be found in mid game) with paid online, you might as well. as far as the items go they can hidden items early to mid game, and purchasable late game.
>Level up while holdingThey hold it at level 45 they will all evolve, and the held item isn't consumed and will instead work like a light ball for those Pokemon once they evolve, now they get a usage buff