Daily NPC Battle in Johto

After having finished the Resident Evil Quest on the Evil Vibes Island, go back to Officer Cruger.
He will tell you, that the path to the Old Field has opened.

If you move back, there’ll be an entrance on the right side:

Now move east as much as you can, until you’ll have to move north through some trees:

Officer Hutch will tell you about “a few daily monsters that need defeating“. Continue to move west, to enter the “Mansion loading dock entrance“.

You’ll find 4 rusted Zombies in the Loading Bay: Starting at lvl 60 with Mimikyu, Greninja and Banette. The rusted Zombies‘ Pokemon will increase by one level. So for the first time, it’s level 60 to 63. Furthermore, they will increase by 1 level per day, until they reach level 100.

In front of the final Zombie, there’s a Pokeball with a Rare candy.

Rewards (for all Zombies): 
$3800
626 Trainer exp.
Each time the Zombies increase in level, you gain 1 extra exp; at level 100 it will be 195 exp (start at level 60 with 155 exp)

Sailor Pastelito
$1400
45 Trainer Exp.

Gunner Phil
$1800
55 Trainer Exp.

Sailor Pastelito
$1400
45 Trainer Exp.

Resting Reg
$2200
75 Trainer Exp.

Peaceful Pam
$1175
62 Trainer Exp.

Ghost Kian
$2950
95 Trainer Exp.
+ Random Loot Drop

Keeper
$750
75 Trainer Exp.

The Keeper is located in the Graveyard Cave far north. Take the entrance and follow the path.

Ghost Phil
$650
45 Trainer Exp.

Just talk to the grave and Phil will appear, you will find it at the entrance in the west.

Ghost Marge
45 Trainer Exp.
$600

Talk to Kylie at the Illegal Campsite east of the graveyard. After that Marge will appear at the gravestone a bit back.

TR Egon
$1008
62 Trainer Exp.
15 Gold

TR Ken
$917
64 Trainer Exp.
20 Gold

TR Babs
$1087
49 Trainer Exp.
16 Gold

The Yellow Flowers near the entrance to the Ice Path
All 4 flowers together add up to about:

$2240
170 Trainer Exp.
62 Gold