Ronove has a counter spike damage (480). If it is active at all times due to a glitch toppling it may not negate this particular counter spike. Its counter spike range is only 8 units, so any long range attackers can avoid spike damage. The spike damage can be defended by equipping Spike Defence gems or continually using Shulk's Monado Purge. Be aware that Monado Purge generates AoE volatile aggro.
Ronove is accompanied by two weaker enemies, which can easily be driven off the cliff by using any arts that inflicts knockback. Ronove unfortunately is immune to knockback. This trick is demonstrated in the video below.
Riki's "Peekaboo" is an extremely useful art against the Lightning Ronove.
Ronove has a double attack rate of 15%. Inflict paralysis to temporarily disable its double attack.