it evolves at lelvel 89
It evolves at level 30, but it does need to be any season apart from winter.
Riolu does not evolve at a specific level, its evolution is related to happiness. While levelling up does increase happiness, in theory a Riolu can evolve at Lv2 if happiness is increased by other methods.
level up with happiness value at 220 during day
It evolves out of happiness, not level. So, fight with it a lot, give it berries, massages, etc
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Riolu evolves into Lucario by leveling up with a happiness value of 220 during daytime
Riolu evolves at maximum happiness, not at any specific level.
train it til lv. 30 or up
level 20 or 30 without using rare candys
Emolga does not evolve. I played Pokemon White also and it does not evolve. Some Pokemon do but this one does not evolve.
Riolu evolves by happiness during the day.
To evolve Riolu to Lucario you must first obtain enough happiness, then level it up.My advice to evolve Riolu is to go down cycling road, don't use repel though because you have to level it up so you can tell when it has enough happiness.That's how to evolve Riolu into Lucario.Riolu evolves into Lucario as soon as it reaches maximum happiness. You can do this by giving it poffins that it likes, walking around with it holding a soothe bell (Pokemon mansion), battling with it, or by giving it massages in Veilstone City.Riolu evolves when you have maxed out your friendship level with it.