Up to 25 decorations may be placed in the base (including the five Welcome Mats that are set out by default for Secret Pals, but which may be put away if they are unused).
That means no. You cannot increase the maximum amount of spaces you have left for decorations in your secret base. If you want to have just the dolls, I suggest you put all of your non-doll items back into your secret PC. There are 34 dolls, 10 big, 24 small. If a doll is small, it takes up a 1 x 1 area, if a doll I'd big, it takes up a 2 x 2 area, the size of a doll does not affect how many decoration spaces it takes up. (If you have 8 decoration spaces left and place down a big doll, you would have 7 left)
List of dolls:
Pichu Doll: Small Get it from secret pals, secret bases or Lilycove Department Store
Pikachu Doll: Small Get it from secret pals, secret bases or Lilycove Department Store
Marill Doll: Small Get it from secret pals, secret bases or Lilycove Department Store
Togepi Doll: Small Get it at Lilycove Department Store
Cyndaquil Doll: Small Get it at Lilycove Department Store
Chikorita Doll: Small Get it at Lilycove Department Store
Totodile Doll: Small Get it at Lilycove Department Store
Jigglypuff Doll: Small Get it from secret pals, secret bases or Lilycove Department Store
Meowth Doll: Small Get it at Lilycove Department Store
Ditto Doll: Small Get it at Lilycove Department Store
Clefairy Doll: Small Get it at Lilycove Department Store
Smoochum Doll: Small Mauville City - Speak to man outside former Game Corner
Treecko Doll: Small Mauville City - Speak to man outside former Game Corner
Torchic Doll: Small Mauville City - Speak to man outside former Game Corner
Wynaut Doll: Small Get it from secret pals, secret bases or Lilycove Department Store
Duskull Doll: Small Get it from secret pals, secret bases or Lilycove Department Store
Boltoy Doll: Small Get it from secret pals, secret bases or Lilycove Department Store
Kecleon Doll: Small Get it from secret pals, secret bases or Lilycove Department Store
Azurill Doll: Small Get it from secret pals, secret bases or Lilycove Department Store
Skitty Doll: Small Get it from secret pals, secret bases or Lilycove Department Store
Swablu Doll: Small Get it from secret pals, secret bases or Lilycove Department Store
Gulpin Doll: Small Get it from secret pals, secret bases or Lilycove Department Store
Seedot Doll: Small Receive from Lanette in Route 114 (OR)
Lotad Doll: Small Receive from Lanette in Route 114 (AS)
Substitute Doll: Small Get it at Lilycove Department Store
Snorlax Doll: Big Get it at Lilycove Department Store - Clearance sale on roof (Saturday)
Rhydon Doll: Big Get it at Lilycove Department Store - Clearance sale on roof (Saturday)
Lapras Doll: Big Get it at Lilycove Department Store - Clearance sale on roof (Saturday)
Venusaur Doll: Big Get it at Lilycove Department Store - Clearance sale on roof (Saturday)
Charizard Doll: Big Get it at Lilycove Department Store - Clearance sale on roof (Saturday)
Blastoise Doll: Big Get it at Lilycove Department Store - Clearance sale on roof (Saturday)
Wailmer Doll: Big Get it at Lilycove Department Store - Clearance sale on roof (Saturday)
RegiDolls: Big Scan these QR codes, talk to the base owner you should get one of the dolls from each of the owners.
Hope I helped!
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