Riolu evolves into Lucario when having High Happiness in Day time.
None of the older Pokemon have Pre-evolutions or evolution in Black and White, including Lucario.
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.
Riolu doesn't evolve by level, instead it evolves when its friend ship is maxed out at daytime and leveled up.
4567
it evolves at lelvel 89
riolu evolves via friendship
If you want riolu to evolve, make him happy
Its friendship needs to be atleast 220 (max is 225), and level up during the day time.
train it til lv. 30 or up
He only evolves through happiness
evolve a riolu from challenge cave your welcome :)the dude
It doesn't evolve at a specific level, but it will evolve when leveled up with high happiness during the day.