As you come from the south-eastern cave, you’ll arrive at the Cinnabar Island side of Route 20. Immediately to the right is a Picnicker. To her right is another Heart Scale, but this time in plain sight. If you want, you can swim across the water to get past her on the right.
Irene’s can use Bonemerang for STAB, or Thrash to inflict heavy damage, but at the risk of causing confusion to itself. Stick to super-effective Grass, Water or Ice-types and you should be good.
Next can be Gloom. In case you haven’t committed it to memory, this evolved is still weak to Fire, Flying, Ice and Poison. Irene’s can use Mega Drain to steal HP and Moonblast to hurt Fighting and Dragon-types.
Jump into the water and travel west. As you’re about to leave the the west side of Seafoam Islands, there’s a female swimmer bobbing up and down.
Keep going west. After a short distance, there’s a small island halfway up the route. On the island is a lonely trainer and 3 Ultra Balls.
Bird Keeper Roger
Roger’s brought out the big guns! These are all fully evolved Flying-type Pokémon! Hopefully you have some Electric, Rock or Ice-types handy.
First up is , which is an evolved . This can use STAB Drill Peck, and Quick Attack to go first. Electric and Rock-types should be cautious of its Drill Run. Use Ice-types if you can.
A little ways north from this island, there’s a male swimmer floating around. Go and greet him if you want.
Back to the scheduled programme. Dean’s is fairly straightforward, with STAB Scald and Psychic. The best way to combat it is by using Electric, Grass, Bug, Ghost or Dark-types. Grass/Poison-types should beware of its Psychic.
Afterwards, he may send out Kingler. This evolved can use Crabhammer for STAB, or Stomp to chip away at foes that resist Water. A Grass-type is ideal to weaken the damage from Crabhammer. But a good Electric-type can probably one-shot it.
Finally, Tentacruel is an evolved . This sinister jellyfish is still weak to Electric, Ground and Psychic. It can use STAB Surf and Poison Jab. Ground-types should be avoided unless you really trust in them.
Carry on west from the small island where the Bird Keeper was. A short distance away and a little bit south is an even smaller island. On it is a Picnicker.
Next, there’s a female swimmer a short distance away from the west of this tiny island.
If you haven’t seen an evolved before, this is it. It has exceptional Defense, but abysmal Special Defense. Nora’s seems to be poorly trained as its best move is Water Gun. Did she use a Water Stone too early? Slap it silly with Grass or Electric-types.
Next, head north from Nora to reach a third island. Here, you can pick up a Max Repel to the right. Hop back into the sea and head directly west. There will be another female swimmer not too far away.
shouldn’t be a surprise. Melissa’s can use Waterfall for STAB, Quick Attack to try and attack first, and Megahorn to deal Bug-type damage. If you have a Grass/Poison mon, you don’t need to worry much, as Megahorn will inflict neutral damage. Otherwise, choose an Electric-type if possible.
Next is , which isn’t a Water-type, but close enough we guess. This charming lady is weak to Fire, Rock, Bug, Ghost, Dark and Steel. We’d be surprised if you didn’t have one of those. For attacks, it can use STAB Ice Beam and Psychic, plus Lovely Kiss to inflict Sleep.
Moving on, there’s one more island to Melissa’s south. In the middle is an Ace Trainer. If you search the left side, you can find some hidden Stardust too.
Ace Trainer Marty
Golem is a fully evolved . This rock-hard beast is still weak to Ground, Fighting and Steel, and immensely weak to Grass and Water. For attacks, it can use STAB Rock Slide and Earthquake. Because of the latter, avoid fielding Steel-types.
Marty’s second Pokémon is , which is a pure Bug-type. This one can use STAB X-Scissor, plus Superpower to hurt Rock-types etc. The latter will reduce Attack and Defense, so it’s only threatening the first few times. We suggest sending out a Fire or Flying-type.
Finally, carry on west for a wee bit longer and you’ll reach Cinnabar Island. Now you can relax for a while. All that surfing and cave exploring must have tired you out.