Love, Metal Hippoe (Hard)

Difficulty
Metal Hippoe appears as a boss about 5 times (first at 989,000 base health, then 899,999, 799,999, the etc. until 599,999, where he appears for the last time.)

Appears
This stage appears at specific days and times in each month, each stage stays for an hour: Please note that this stage appears depending on your device's time and date.
 * 1st - 7pm
 * 2nd - 12pm
 * 6th - 12am (noon)
 * 8th - 6pm
 * 12th - 3pm
 * 13th - 12pm
 * 17th - 7pm
 * 19th - 12pm
 * 20th - 5pm
 * 23rd - 2pm
 * 25th - 12pm
 * 28th - 4pm

Strategies


Metal enemies only take 1 damage per attack from any cat, the exception to this is critical hits.


 * Since Metal Hippoe only takes 1 Dmg per hit, cats with fast attack speed are pretty useful.

This stage is pretty easy, the only thing you really need to do is to spam Giraffe cat. Crazed Cow, Mr. (don't buy him though) and Lion cat also help.

Reference

 * http://battlecats.spica-net.com/chaptime/kaba1.html