I never really noticed that the final stage boss conjures up a great deal of monsters on the playfield causing slowdown to the pace of the game.I find that this slowdown increases the difficulty....then you have the lightning bolts reigning down...how do you evade the lightning bolts if you don't get any hint that they're coming?
BB
For the lightning bolts, you do have a warning that they're coming. It's based on the symbols that appear in the background. Basically, pay attention to the colors first.
If the colors on the "clock hands" are pink, green, or yellow (I think orange might be one too), then he's summoning enemies. Pink for zombies, green for turtles, yellow for ghosts. Stay at the bottom center and don't be on one of the platforms where they'll appear. He generally only does this when there are not many enemies on screen (since you need enemies to actually damage him).
When blue symbols start appearing that means he'll either summon the 4 swords attack (easily dodged with a well-timed jump), or the lightning bolts (keep moving). The problem is they're both blue, so it's not so simple to tell by the color. Instead you have to note where on the "clock" the blue symbols are appearing.
12 o'clock, 4 o'clock, 8 o'clock = swords
2 o'clock, 6 o'clock, 10 o'clock = lightning
I don't think he does the lightning attack until he's taken at least 2 points of damage, so keep that in mind too
