Question

I want to teach Chikorita AncientPower as an egg move which covers all its weaknesses except Poison.

Answer 1

Ancient Power does cover all of Chikorita's weaknesses, although you might consider HP Rock for this job, because of a better power. In my opinion, you should teach him Ancient Power because of the neat side-effect.

Comments

Although the side effect is only a 10% of activating and ancient power only 5pp(max 9 I think)

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(Max 8 PP) And to correct NJ, both Hidden Power and AntientPower have 60 power.

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Hidden Power can have a cap of 70, actually, making it stronger...

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HP varies from 30 to 70, so in general AP is more reliable and easier to get.