Tropius Razor Leaf vs Marshtomp
[Level 30 +0 55 with 55BP] vs [+0 55 with 99HP]
85 (85%) - 100 (101%)
12.5% chance to OHKO
Tropius Razor Leaf vs worst Castform
[Level 30 +0 55 with 55BP] vs [+0 36 with 70HP]
31 (44%) - 37 (52%)
0% chance to OHKO
Tropius Razor Leaf vs best Castform
[Level 30 +0 55 with 55BP] vs [+0 51 with 77HP]
22 (28%) - 27 (35%)
0% chance to OHKO
worst Castform Powder Snow vs Tropius
[Level 25 +0 36 with 40BP] vs [+0 57 with 106HP]
27 (25%) - 32 (30%)
0% chance to OHKO
best Castform Powder Snow vs Tropius
[Level 25 +0 51 with 40BP] vs [+0 57 with 106HP]
34 (32%) - 40 (37%)
0% chance to OHKO
Marshtomp Strength vs Tropius
[Level 34 +0 79 with 80BP] vs [+0 68 with 106HP]
27 (25%) - 32 (30%)
0% chance to OHKO
Plan: Have Castform pre-damage Tropius to around 25%, then swap to Abra or die and kill Tropius with Marshtomp, gaining it enough exp for Level 35, so it evolves from the Candy.