One of the unique things about Floccesy Ranch flavorwise is that it houses all those Mareep. If Mareep or Flaaffy were able to be found elsewhere, it'd sort of ruin what Floccesy Ranch is known for in the game, per se.
As for Route 16, maybe Pinsir and Heracross as version exclusive Pokémon (5% shaking grass encounter rate)?

















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-Lucky,
-Pichu,
-Raichu,
- Vileplume,
-Bellera,
-Hunbro,
-Entei,
- Darunia,
-Burning,
-Mew,
-Flybea,
- Azumarill,
-Weavile,
-Arceus,
- Blaxorus,
-Janine,
-Swampert,
-O'kee,
-Purple,
-Suicune,
-Raikou,
-Furret,
-Blupo,
-Charming (first random encounter on Black),
-Blingblang,
-Tempos,
-Whiscash,
-Rueben and Rubri,
-Goragal,
-Starmie,
-Porygon-Z,
-Athena,
-Jim Bo,
-Pinkeye (first ever shiny encounter on Emerald).