there are some Pokemon that only lay eggs by holding a certain item.Examples:Snorlax, Cherrim ,etc.
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Then, what item does Cherrim need?
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Riolu is 4 generation Pokemon. You can get egg only in Pokemon Diamond and Pearl
Players can only get the lucky egg in Pokemon Pearl from the wild Chanseys. Lucky eggs are very difficult to find in the game.
any
In Pokémon Pearl, in order for Cherrim to lay an Egg, you need to have a female Cherrim be put into the Daycare in Solaceon Town with a male Pikachu, Raichu, Clefairy, Clefable, Jigglypuff, Wigglytuff, Chansey, Togetic, Marill, Azumarill, Hoppip, Skiploom, Jumpluff, Snubbull, Granbull, Blissey, Shroomish, Breloom, Skitty, Delcatty, Mawile, Plusle, Minun, Roselia, Castform, Snorunt, Glalie, Roserade, Pachirisu, Togekiss, Froslass, Bulbasaur, Ivysaur, Venusaur, Oddish, Gloom, Vileplume, Paras, Parasect, Bellsprout, Weepinbell, Victreebel, Exeggcute, Exeggutor, Tangela, Chikorita, Bayleef, Meganium, Sunkern, Sunflora, Lotad, Lombre, Ludicolo, Seedot, Nuzleaf, Shitry, Cacnea, Cacturne, Tropius, Turtwig, Grotle, Torterra, Cherubi, Cherrim, Carnivine, Snover, Abomasnow and Tangrowth. You could also put a Cherrim of any gender into the Daycare with a Ditto in order for them to breed so that Cherrim will lay a Cherubi Egg.
it will hatch into Happiney