You don`t really need to but it`s faster. If you don`t know where to get , it is in the Trophy garden or Pokemon mansion it doesn`t matters how you call it now back to the point it is in one of the rooms.
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give him a vitamines like proteins and let it hold an item name soothe bell and only one lvl he will evolve into lucario.
No, you do not need a stone to evolve Riolu. To evolve Riolu, you have to make it happy in the daytime. The quickest way to do this, instead of battling with it like crazy, is to first give it a soothe bell. Then feed it poffins, give it those nutri drinks like zinc and carbos to its max. Then level Riolu up a level and he should evolve into Lucario. -Hope this helps! ;)
You give on of your Pokemon the soothe bell and it will get happy faster.(It helped me evolve my eevee and togepi.)
most people say 100 happiness so if you want to evolve it from an egg it should have about 70 happiness so give it proteins irons etc. and give it a soothe bell and battle. p.s. don't let it lose
Roselia doesn't necessarily need a soothe bell to evolve, but yes it would increase the happiness level of Roselia which is one of the requirements. The additional requirement for Roselia to evolve is that you must give it a shiny stone during the day.