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Do like me. Have a backup. Scraggy has amazing def and a great movepool that covers most weaknesses (dark, fighting, elemental punches, etc) so I suggest him being your physical sweeper. I cleaned the 7th gym just using Scrafty and ice punch.
Just equip an exp share and grind a bit to catch it up. Krook is a wonderful choice for ground but you can use him in your main party switching him and Sigi out.
Or you can avoid Sigi completely and go pure flying type with Unfeazant or Altaria