Ruins of Alph is a mysterious place where the Unown live.
First battle (repeatable)
You need to defend fossils at the end of passageway. Attacks from Unown are varied in types and damage. Thus, it is important to arrange the Pokémon in order to minimize the damage taken. (Most damage is dealt on the leftmost Pokémon)
There are eight spots available, and the Unown come from the left. When they pick up fossils on the right, they need to go back.
Second battle (non-repeatable)
There are spots surrounding Entei in upper part of Ruins. There are two layers of spots available in the lower part of the Ruins.
Occasionally, Entei would fire a fire-based blast to the allies in the lower part.
Pokémon with high defense and 1/4 multiplier advantage against fire (Geodude or its family, Wooper or its family, Onix but not Steelix) can be used at spots closer to Entei in the lower part to protect the main Pokémon fighting the Unown. These Pokémon can also be used against Entei since they are effective.
Since the Unown attacks are variable in types and damage, Pokémon with fewer vulnerable types should be used.
- Arbok have decent defense and its move Crunch is effective against Psychic-type Unown
- Rattata can learn Crunch while it is Normal-type: only weakness is fighting; and ghost-type cannot hit.
- Jumpluff and its family also have high defense and can cause status problems with powders.
- Gastly and its family can induce sleep and allow more time for attack. Moreover, ghost-type moves are super effective on Psychic-type Unown.
You can also block Entei's attacks by placing a Pokemon in front of the Pokemon he is attacking, still causing damage, but very minimal damage compared to not defending against the fire-based blast.
Pokémon Found in here
Mawhile (Hoenn Invasion)
Zubat (Hoenn Invasion)
To access the second area you need the attack Surf. You can access it through a narrow tunnel in Union Cave.
In Hoenn Invasion, you can find Roselia, Surskit, Illumise, Zigzagoon and Nincada